Writers groups are fine and I have participated in several over the years and am not adverse to doing so again.
However I can tell you, the BEST writers group is just yourself. If you want to write and be successful, sit your fundament in the chair and write every day.
I know many successful writers and have had a reasonably good career myself ... ALL the writers I know work alone and consistently and FINISH things. That’s how it’s done.
--Ralph