drones are definetly something i would consider doing only problem is to find a purpose for them and most airbases already use 4 or 5 slots and more then 5 planes on one airbase doesnt work well

out of curiosity, what about making mods for scout/attack drones, be it additions to bases or dedicated units, not sure how well it can be done or if its something that interests you, but given how drone warfare of today is expanding rapidly, might be interesting, could work hand in hand with the arsenal bird mod, specifically the loyal wing men drones it uses, which are being designed around the world currently.
speaking of other mods might be worth working with the mod adding variants of land forces, some interesting ideas.
Again just randomly suggesting things as you have covered a lot already, hats off to you.