Should I message someone who I have been ghosting for almost two years saying that I'm sorry or should I just block them at this point?

Yes ghosting is female behaviour if you don't want to talk to someone tell them like a man. You should apologize for acting like this

i should do this

instead of apologizing, you could try to thank them for all the good times, or just let them know how much you meant by writing something

it went well for me in the past