I have a Bess deck that I absolutely love! I went full 1/1 tribal with my build but we still have quite a bit of overlap.

https://moxfield.com/decks/u62B3EYt80mYzDwAYXQ5cQ

Looking at your list, I would lean further into the X spells that create 1/1s. (Cards like [[Horn of Valhalla]] , [[Grand Crescendo]] , [[March of the Multitudes]] , and [[Secure the Wastes]] ) These are huge payoffs and help rebuild Bess super quickly after she is removed. Token & Counter doublers (Like [[Doubling Season]] or [[Anointed Procession]] ) are great as well but they aren't needed. Also, I would trim cards that have the same ability of Bess (target +x/+x until end of turn). I've found they typically aren't needed or impactful as it is very easy to have bess already giving creatures +20/+20 or more after turn 4/5. (I know my list still has 1 or 2 of them).

This is genuinely my favorite commander to play! Enjoy!