Adding new content would mostly likely help alot.
It is not, compared, that much work to use existing plane models to extend the planeset and add a few iconic vehicles.
Im thinking of BF109g6as, BF109g6as, FW190A9(TS engine), and allied fans can fill in the blanks.
Some planes need minor changes A36 come into my mind, spit5VD, FW190A2, Mossie variants.
Add StugIII M10/M36 Firefly (buy a few 3d artist works from a low cost country)
Please leave large maps out of rotation, ask our talented mapmakers to focus on new smaller maps.
Please fix the obvious faulty damage models (Yak3, B26)
Old players may return, scenarios might get a new twist reusing old maps.
If last addon was 2014 it is probably time do do something.