If you'd like, you can try using some of the arguments I've made on here for the vaccine based on my education in biology and the scientific research I’ve done on the vaccines:

If one looks into the science and research behind mRNA technology, then one would know it's very safe with decades of development and testing behind it (mRNA vaccines in general, not the specific COVID vaccine).

The only ingredient in the vaccine that does not have long-term health effect studies is the mRNA itself, and mRNA is just a way our cell nuclei communicates with the cytoplasm. The cytoplasm reads the mRNA, like code, and synthesizes a protein. mRNA-facilitated protein synthesis is a VERY well understood biological process, and it's something our cells are doing CONSTANTLY. Thus, the mechanism by which the vaccine confers immunity is a very natural, fundamental biological process - the vaccine just tells a few of your cells to temporarily make a new protein, the COVID spike protein, which is actually somewhat toxic on its own, but FAR less toxic than actual COVID since it cannot reproduce exponentially or destroy cells like a virus can. The immune system detects, promptly destroys, and learns from this protein, allowing it to create antibodies so it is prepared to respond hard and fast when it detects the real thing. The mRNA is rapidly used up by the cell cytoplasm as our cells manufacture the spike protein, and it is completely gone from your body within a few days. And like all other proteins synthesized from our cells, the spike protein is gone within a few weeks. All that remains are the antibodies.

So, we know for a fact that the mRNA and spike protein does not linger in your body for longer than a few weeks, we know mRNA itself is harmless because our bodies are constantly producing it themselves naturally, we know the spike protein is far, FAR less dangerous than actual COVID, and we know that every other ingredient in the vaccine does not have any significant negative health effects. So if you understand the science behind mRNA protein synthesis, and you've read the vaccine studies, there is no logical reason to think that there will be any long term side effects.

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Take a look at the actual data and statistics. According to the CDC's VAERS tool, there have been a little more than 50,000 reports of adverse reactions, and a little less than 8,000 of which are classified as "severe". Keep in mind this VAERS tool does NOT verify that the vaccine is directly responsible for these effects, so the number of actual adverse post-vax events is likely lower. But even if we assume all 50,000 are as a direct result of the vaccine, out of 167M fully vaccinated Americans that means the rate of adverse side effects is ~0.02%, and the rate of severe side effects is ~0.005%.

Meanwhile, the COVID death rate for unvaccinated people is 2-3%, which is 100-150x the chance of getting a mild-to-severe side effects from the vaccine and 400-600x the chances of getting a severe side effect. And the rate at which one gets long-term effects from COVID (again, if unvaccinated) is 8-10%, 400-500x the chances of getting any vaccine side effects, and 1600-2000x the risk of getting severe vaccine side effects.

It only takes very very simple mental calculus to see which risk is objectively better to take. You either take the risk of getting the vaccine, or take the risk of getting COVID. People who make the decision to choose the risk of COVID over the risk of the vaccine are either incredibly ignorant, or they make really really stupid decisions.

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The reason I say the long term side effects from COVID are more severe than side effects from the vaccine is because we know the only harmful or toxic part of the vaccine is the spike protein that our cell's cytoplasm manufactures. Obviously, the COVID virus also has those toxic spike proteins, except with the virus, the dose of spike proteins our body has to take is orders of magnitude greater than the dose of spike proteins from the vaccine since the virus can replicate itself exponentially. So any long-term side effects you get from the vaccine, you would've gotten much worse long-term side effects from the virus itself.