I skipped Chimera Squad and Gears Tactics for the moment and am playing Troubleshooters instead. A bit of a disjointed Manhwa XCOM style game. They clearly initially wanted to make some kind of cooperative online game, but along the way it morphed into a single player game with a campaign (and some grind elements).
Not finished it, but my advice after the first 20 levels is to not turn on extra XP gain option so you don't overlevel content too much and turn on challenge mode to always in options (level scaling). Except when you need to grind out some drops for a quest, then just beat up low level monsters with a high drop rate overleveled build for a bit ... it's Korean after all.
Part of the game leveling mechanics are discovery based, unknown combinations of character options will produce more powerful results ... which I don't like. I don't mind the randomness in what you get, but basically everyone who plays will just look up the combo guide. So just put that info in the game. You need to look online any way to understand what the game wants you to do, it tells you to do a lot of things which you can only do after you level more for instance. The game is a bit obtuse.
The story is more engaging than what I saw of Chimera Squad and Gears Tactics ... if you can stand the shonen tropes.