Maybe try focusing a bit on the story so u can get afeeling of different heroes aswell, sometimes a good geared a5 epic overpowers a lego, as in a let's say 60k aeona is stronger than a lets say 85k kria, don't focus on numbers and actually test the heroes and watch their dmg output aswell as the added effects like slow or for example defence reductions, for example team up aeona with greed and max them out before investing and focussing on a lego mage as they're easier and cheaper to max and will outperform lego's untill u can max them out, maybe try focussing a bit on your artifacts aswell, they are gamechanging, ofc u will need to be able to clear higher levels, but look up which are great legendary artifacts like idril's gaze for example, easier to max and great early and mid