The major 7 is a very distinct voicing, and it's hard (IMO) to get it to fit where it didn't orginally go. Of course, the best way is to just jam on something and use whatever sounds good to your ears--theory out the window!
I try to get away with as many 7ths, min7ths, and 9ths as I can. I find that the biggest thing to keep it interesting is simply learning at least 3 ways to finger any chord. That doesn't change the actual voicing, of course, but it puts you in a different textural range, so you can fill the spot that needs filled.
Welcome, by the way. Hit us back with anything you may need (or any thing you may have!).
God bless.