I have yet to see a particularly compelling argument against determinism. That said, it's clearly impossible to base your life on this doctrine. Even your question "what do i do?" makes no sense in a deterministic context. Why seek advice you're powerless to implement? Why complain about a solution being unsatisfactory if you're powerless to change it? Why even ask why about any of these things since you were powerless to do anything but make that post in the first place?

I think the solution is to accept determinism as being true and just file it away in the back of your mind, only to be pulled out in the case of extreme philosophical debate. Then live your life assuming that people have free will. It's not a particularly satisfying option intellectually, but I don't think an option like that exists.