You should start running your training camps 7/7 24/24 and start leveling
Proteus, Rigard
Melia, Kailani
Kiril, Sonya
Gadeirus, Berden, Caedmon
Boldtusk, Gormek, Scarlett
Just them, stop leveling few levels on your other ones.
lv 38 and 61/77 hero capacity fulled with low level heroes tells me that you should really read some basic guides such as
However, welcome back to the forum 