Masters level player here. Your friend is very, very, very, very wrong. You played that all extremely well. People feel like you should "get in the enemy's face" because they see streamers do it, but streamers only do it because they know they're significantly better than almost anyone they will face and they can get away with that. Go watch a pro game just once where they're against players their own skill and you'll know how stupid it is to say you played bad because you didn't get in someone's face or be more aggressive. They play much more similar to you. I have a Pred teammate that you'd have to drag off the high ground kicking and screaming before he'd move and rarely gets in people's faces. He's an extremely good player. He just plays for the win rather than style or fun and crazy movement.
Things I saw wrong were very minor and I'd say you have impressive game sense and aim for the most part that could take you very high. Here's a small list:
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Always have your shields pre-selected instead of syringes ahead of time so you can quickly heal without switching
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When you were up top waiting for them and the caustic ran by, you should have already been ADS'ing looking at the hallway so you could have started shooting the moment the Caustic ran by. You could have knocked him and the fight would have been easier if you were ready for him. I probably would have had my re45 out instead of the scout as well at that range.
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You probably should have used your phase after punching the Valk and gotten to the middle area behind cover to heal. You knew there was no opponent that way and if the Valk chased you know she'd get shot in the back (it would even bait the Valk into putting her back to your opponent). You were very low and couldn't heal where you were without risking getting knocked at that point. Small thing but probably the right call (although it might have gotten you killed in this circumstance because of the second team, but I don't think you knew there was a second team in advance)
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You should have shield swapped off the boxes most likely instead of slow healing after the first fight
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In the second fight, I'm not sure if it was an accident but you shouldn't have dropped off top and should have held your spot of advantage up top there - a.k.a. have been LESS in their face. Once you did drop off though you played it very smart to instantly phase out. If you're up top still, that pressure would stop any rez attempt and you'd force your opponents to be looking up at you when your teammate arrives or look away and let you easily kill them. You also likely wouldn't have gotten so ripped.
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I'm watching on my phone so I couldn't tell if you had a clear vision of the rez at the end. If you did, you should have cancelled the heal and swapped to your scout and shot at him, forcing him to either stop the rez or get knocked himself, either way being an easier target for your approaching teammate as he would have less health. If he ever looked like he was going to return fire though you would instantly stop shooting and heal behind cover. Your main objective would be to stop the rez and possibly soften him up for your teammate while not getting knocked yourself, and there would be no reason to trade health when you were so low. If you did get knocked, even though you were very unlikely to lose the fight overall at that point, you never know if another team would show up before you got rezzed.
If you couldn't see them but knew they were rezzing, you made the right call to finish the heal (one of the biggest mistakes I consistently see in lower elos is not healing often enough).
I don't necessarily agree either with the other comment that said staying in one place is a bad thing. If you have the position of advantage, you do not give that up unless there's a reason to, and being wraith, if a reason popped up you could probably phase out. You should always be looking for the high ground, and again, another huge mistake I consistently see in lower elos is people dropping from the high ground or giving up their position of advantage when they shouldn't. The only reason you would change positions would be if the position left you vulnerable from an angle that you couldn't cover and thought they could rotate to, if you were trying to surprise or flank them, or if you were out numbered and likely to get overwhelmed by multiple opponents at once (why you see a lot of streamers move a lot since they try to take on teams by themselves).
I was especially impressed with:
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your restraint, such as not chasing the caustic that was one hp out the door and getting shot in the back of running into his barrels and knowing not to shoot when the second team was together and waiting for someone separated and in the box to shoot,
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your understanding of the importance of advantageous high ground and holding it,
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your correct use of cover with using the edge of the high ground as you look down and not revealing more of yourself than you had to.
In general, I would say the biggest thing I saw that you could improve on is speed and comfort with the controls. You should have instantly ADSed at the Caustic running by and probably knocked him but didn't start shooting until he was halfway across your screen. Your healing was slow, clumsy, and delayed with lots of pauses (this gets you killed as getting one more cell off will often be a difference maker). Your looting is way too slow and you picked up things you didn't need like ammo for other guns that will slow you down farther later when you have to drop or swap it.
In general though, keep playing exactly like you're playing and ignore your friend and you'll likely go a lot higher than him unless he's much more mechanically skilled and uses that as a crutch.