Cinderhulk era showed us that when tanks can front-line, every other role can then have value
This should be the first step to fixing the game. Give tanks defensive stats and that will make ADC's and supports valuable again for their DPS, which will make mages and assassins important for outdueling adc's, which will in turn create a purpose for fighters. If tanks don't have a strong role, everything else falls apart. True damage, nerfs to the health of tanks items (and champions), and a lack of viability with the scuttle changes and low exp in jungle have shifted the meta into chaos and everyone's hands are being forced to play the new meta.
Please don't take this as a "buff tank damage" thread. Tank players just want to be able to soak and would be thrilled if that could happen. They don't have to chain cc or one shot people to be viable, but they do need to be able to front-line and have an avenue to hit 6 or get their first item without falling so far behind others that they can't contribute.