Seeing as I just started another playthrough a couple days ago, this is a pretty easy recommendation first up: Battletech (PC).
I will say Battletech is a lot different from the SRPGs you've mentioned so far-- sci-fi, western-developed, much less conventional gameplay, you only get 4 units max and they're all big Mechs, less focus on heroism and more about straight money-grubbing and survival...
It would be a bit of a steep learning curve at first, there's a lot of different mechanics and info to digest, but trust me, it's well worth it.
If you want a more comfortable Japanese SRPG that's more like what you've already played but also focuses on mechs, try one of the SD Gundam games. 'SD Gundam G Generation Cross Rays' is the one I tried recently (bought from Steam), and from what I played it was pretty good. Even better if you've seen most of the associated tv series.
Outside of that, I'd also recommend Mechanicus (Warhammer 40K based, very unique, available everywhere); Into the Breach (PC and Switch, indie, much smaller in scale but easy to play through with good replay value); and Advance Wars (you should know about this already, launches later this year for Switch.)
Edit(after going back through my games played list): 13 Sentinels: Aegis Rim (PS4)-- bit of a stretch, gameplay is a hybrid between a 2D interactive visual novel-esque mode, and a 3D real-time strategy mode. Also focuses on mechs. Great game if you've never checked it out.Last edited by Shaunodon - on 13 July 2021