Idea#1: adding a crate which you can get at the end of battle pass for free and if players want more they can buy it in store. The crate has different rewards like, emotes, weapon skins, operater skins, stickers, etc. . ( inspired from world of tanks blitz)

Idea#2: add a lucky draw system where you get like first couple of spins for free and then you can use splitcoins for more, also has the same kinds of rewards as mentioned in idea 1 . ( inspired from codm, their weapon armory draws)

Idea#3: keep as many events as possible were there are weapon or operator skins for free because that will attract more free to play players which can latter also buy stuff.

Overall try to keep the game more like free to play rather than buy to play because gamers will love if then can get free skins which will make them more engaged.

All of these ideas were to give the game's player base a boost.