I took an almost 4 year break from the game, and quickly got back up to speed and managed to get Grade 5 back tonight after about a month.
So, what’s next?
I can continue to keep up my hours and landings, but not sure what else I can do. Looking for what other Grade 5’s do to stay engaged.
Being part of VAs is something that works for me. You can be around people from same background as yours and also meet new ones .
You could also try controlling (if you are not IFATC alr), that is interesting as well, you wont realise where time goes in a decently busy airspace. Welcome back 
I do touch and gos at Saba (TNCS - in often interesting winds) every now and then to keep my landings up. As a member of IFATC, that keeps me occupied as well.