I'm a huge RTS enjoyer but never could get too into the faster modern RTS games so let me recommend Dune: Spice Wars or Northgard, both are made by the same devs and go for a very relaxed and tactical pace, there are still moments where you might have to react to something happening fast, especially in Dune (sand worm might be about to eat your army, if you aren't paying attention they will all die within like 10 seconds) but they are both pretty fun. Sins of a Solar Empire also has a pretty deliberate pace, I haven't tried the new one yet though.
I'm a huge RTS enjoyer but never could get too into the faster modern RTS games so let me recommend Dune: Spice Wars or Northgard, both are made by the same devs and go for a very relaxed and tactical pace, there are still moments where you might have to react to something happening fast, especially in Dune (sand worm might be about to eat your army, if you aren't paying attention they will all die within like 10 seconds) but they are both pretty fun. Sins of a Solar Empire also has a pretty deliberate pace, I haven't tried the new one yet though.