Advice for my heroes and how I should proceed. Dont spend money have been playing for 5 or 6 months now

I copy from your 1st post which is you can not create new thread yet.

IMO, priority left to right project leveling heroes.
Red: -
Blue: Finish Frida, and start Gato, but you already start Karil, so finish Karil. After Gato, next Ulmer. Greymane after there are no other blue.
Green: Finish Ishtak, Muggy, Berden
Yellow: -
Purple: Gill-Ra, Tyrum, Oberon, (Renfeld and Prisca only if you do not have other purple)

source: