I have posted many times the best solution. The best solution is and always will be a balanced approach. No more gutting mythics into oblivion. No more having them rain down like candy or being super rare. Lets approach all things with balance.
Make mythics op and buff bad ones and make some for slots that dont exist like lets make fist of fate with huge lucky hit a new mythic. IT was super good item that made lucky hit builds work. Then lets limit mythics to one per character. Mythics would not be craftable. WE have enough crafted items. Mythics would be uber dopamine hit because they are only drops. They would also have 4 set affixes back [all good ones] and have at least 1 GA. Also sparks allow enchanting of mythics and always give GA on enchant. Fun!
Then make mythic quality epic rarity. No need for this to conflict with itself. You can use as many epics as you can find. Epics are the new chase with mythics. You could even get super lucky and find an epic mythic. What do epics do? Well lets do better than boring same same 30% unique power. Lets expand it to all items. How? Well epic items have a bonus and its not always the same! It could be 2 temper slots or extra socket or 5th affix or greatest affix [100% bonus] or aspect 30% higher or main power 30% higher, ect. Many possibilities and combos. An endless farm. Epics then dismantle into infinity shards and these allow you to enchant epics with GA or guarantee a GA temper and maybe even 100 lets you restore item to dropped state IE erase transfigure, temper, masterwork, ect. Epics would drop at 1% plus 0.25% per torment or maybe even half of this. Fun!