If you can afford it go and get a type rating. If you can go a little further, try and get some hours on type. Its do that or sit around like all the other 250 hour guys waiting for the phone to ring. It probably won’t.
Maybe you could get an instructor’s rating. Good idea but unlikely to make you much more employable than you are now. Go ask my instructor who’s not had a sniff after 4 years and 3,000 hours in a single. Or go ask the other instructor I know who after 2 years buzzing about in a Piper has bought a 737 TR and is now employed by a charter airline on the line.
Ultimately the choice is yours. You make your own luck to a large extent in this life. People will always be quick to slate those who buy ratings. They are usually those who cannot afford them, or those who are already airline pilots complaining of their degrading T&C’s, so either way you can’t win with these people.
Either way, whether you get taken on by an airline and have your typed paid for, they will re-coup their money somehow or other, probably via a reduced salary, so why not just go out there, get a type and earn a normal salary straight of.
As for what type, well, its got to be the 737 or the A320 series.
Good luck with whatever way you go.