I don't know how they can untangle the knot they've gotten themselves into besides just halting releases and reworks to re-evaluate why the community is so unhappy with their releases.
The vast majority of recent champion releases need to have their kits edited and reworked. Same with the champion reworks themselves.
They keep removing weaknesses from champion archetypes, (i.e. assassins shouldn't be able to sustain themselves in fights like Akali, enchanters shouldn't be safe like Yuumi, etc.) Then they go and give champions nearly everything like with Aphelios and Senna to the point where their weaknesses aren't noticeable because they're compensated heavily in so many other areas.
Designing champions that have little to no counter-play has turned this game into a nightmare and each season the meta gets slimmer because there's way too many new releases/reworks to ban and Riot keeps putting out more under the same flawed design philosophy.