There is yet one little move - and it makes a big difference to these Thumb routines, I call 'slapping' -

Simple pattern in E, Thumb the G string evenly - no cross picking here :)(NOTEIt is not necessary to make ANY chord here)

As the thumb goes back up to get the next thud 'back pick' with the nail side of the thumb. (Means pick up as well as down) Sounds like 'ker Thud' or 'thawck Thud' Notice the first sound is an off beat. It can get tiresome so use spariningly. Try some slow blues in E - playing the bass on the E string and a simple melody up high on the E treble strin.

Enjoy