That’s a lot of games!
I’m currently trying the one race I’ve never really grokked - skaven. The key is flanking, and exhausting enemy with the fodder. A few key units will do most of the damage - 4 catapults (2 anti large 2 anti infantry) seem to be working well.
A couple of slave armies follow in tow. They are useful to reinforce in sieges, and as bait - let the main skaven army ambush and let them be bait to draw the stacks out of the defending city first.
Another thing I learned is maxing the ambush skill - this means when you attack you can ambush. if you fail, retreat, try again until you do get that ambush.