Playing in my room with just me and drum machine I have the space to add fifths 7th's 9ths whatever's I want.
Playing live with band I find that I just stick to roots most of the time & adding much more than an occasional fifth to a root is about all I need, playing anything else often gets in the way or adds too much sound.
Is this 'normal'?
I know people say add chord tones, but for the stuff we play if often doesn't fit.
It seems like you just need to do some experimenting with the songs to find the places where your embellishments will fit within the over all structure. You know how to do the "whatevers" now you have to figure out where to fit them in and how to use them. Hard to tell you how and where from here. Can you just get a recording of everything else and play to that in addition to your drum machine work?
But yeah you can certainly thump along with root notes.