^ +1
The trick with EQing is to make sure the spectrum isn't too empty, or too full, in each band. Too much low mids, for example, makes a track sound thin and weak, even with sub support, but too much makes it muddy and unpleasant. What does each part need?
Arrangement helps with this too; if there are two basses at once, why not cut one? Or put them in different parts of the mix?
You can do this with just stock plugins. Except arrangement, you don't need any plugins for that.
(Can confirm this is enough to get on Diversity btw)