in a sort of order (free first) to the ones i've played recently, somethign might take a fancy :
Zero-K - Its Free based on the spring engine - another spiritual succcessor to Total Annihilation
Supreme Command : Forge alliance - i've had many an hour in this game. if online is your thing then get FAF (Forge Alliance Forever for PVP + an assortment or MODS and different PVE), my go to game - spiritual succcessor to Total Annihilation
Check out : Sanctuary: Shattered Sun - Spiritual successor to Supreme Commanded under development by some of the team who maintain FAF
i'm currently going back and finishing CnC3 Red Alert but if you dont own it your not missing anything.
Ones 've been playing recently :
Creeper World 4 - Cracking Dev
They Are Billions
Artificial Extinction
Demeo
Grey Goo - working back to this one and looking forward to it.
Sins of Solar Empire - theres a new one coming soon with an interesting route mechanic
Terra Invicta - possilbe to much of a slow burn
havent played recently but do own & still recomend :
A.I. War series
Hostile Waters: Antaeus Rising - possible its to old of a title for you but fond memories non the less.
Particle Fleet: Emergence - same Dev as Creep world
You also have Home world series
Dont own these played or have a variant :
something hard core : Command: Modern Operations
old school : the original "Carrier Command"
https://store.steampowered.com/app/1802690/Carrier_Command/
starcraft 2 - comes highly recoemended by a lot of people but i havent really managed to get in to it, i went the supreme commander route.