Squad Busters Hero Upgrade Issues

The Hero upgrade requirements are frustrating. The star tokens, chest upgrades and hero upgrades are useful, but from playing the game from the start the characters I can upgrade are already maxed out so it would not do any good to upgrade there. So that leaves me with Emotes (some of which I already owned) and skins (some of which I already owned) and both of which I view as kind of a waste of Hero Points. To that end I need to either use hero points on expensive skins or emotes I don’t care about or characters that are already maxed out. I need more useful options for my hero points to continue to upgrade, otherwise I am just having to waste hero points to get to the level which is not very motivating.
Any tips or ideas for improvement?