I have just started playing Castle Burn as a casual in-between game.
It is a real RTS with income creation, army capacity increases through building more barracks and contrary to regular games like Clash Royal you hold all your units as reseachable cards in game.
You build your deck while playing. This is the best RTS I have seen on mobile so far.
I played a lot of RTS games from Warcraft 1 to Starcraft 2 Lotv and age of empires 1-3 and C&C etc.
Castle Burn is a real RTS for mobile and might be worth a look.