I wouldn’t bother. It’s a waste of energy you could be using to make new friends among unvaxxed people who will be around long enough to grow old with.
At this point, you may be doing more harm than good in that your vaxxed friends may get a booster to spite you whereas they might not bother to get one if you left them alone about the vax issue.
However, I would still keep abreast of research articles on the vaxseem in case your vaxxed friends bring something up. You want to be ready to refute something.