Have you ever thought to start you own ' open mic ' ?
Kinda of how I do things.Sorta.
I get to meet lots of heads of different levels of playing ability - make friends/ bang the tunes out.
Its fun. We rent a studio thats central to the players locations.
Its just as many players as needed - its not a true open mic in that sense - but the players rotate session to session.
I like to cherry pic on various sites for potential jammers.It can be as serious as you want it to be.
Great way to net work , too.
Bottom line is playing with more experienced musicains is key for getting better.