Kisling,
I don't think anyone can tell you what to do.
However, I know if it were my son and he was going to sign, for the sake of signing, I would advise him not to.
Just because your velocity has improved doesn't always mean more opportunities. You have to decide if this is the right place for you, with or without baseball.
If you decide not to sign, you need to get out and be seen more this year, contact schools, be proactive. If you don't want to take that challenge, do the work that has to be done, then sign.
Maybe some of the coaches reading this up your way can give you better advice.