I don't particularly think that grinding levels is necessary or is even really viable. The amount of extra work you have to put in per post to get above 3 exp is pretty prohibitive.

You could wait until the relaunch, but it's not like everything's going to be wiped out or undone, it's essentially just going to be a new thread that picks up close to where we left off with this one. It would be fine to wait through the next two and a half weeks or so until the boss fights conclude, but I'd say to join the fun after that. Plus, there will be some extra changes with the relaunch that makes application a little less lucrative than the current offer.