For old school RTS, Total Annihilation or if you fancy something a bit different then The Settlers II (Pioneers of Pagonia is a more modern remake). I grew tired of RTS and moved on to turn-based but Stellaris is one that recently drew me back in.

For tactics I’d say Advanced Wars, Fire Emblem and Disgagea are decent shouts. Into The Breach is probably my favourite indie of the genre, a lot of strategy packed into a small game.

If you like turn-based then Civ has always been top of my list.

Removed by mod

Jaw on the floor.

Its gameplay is similar to Vampire Survivors. I actually prefer it because it has more characters, upgrades and synergies.