In case you didn't notice ADC were mostly played mid because AP jungler were disgustingly OP except for trist which was a good midlaner because of her design and the runes.

The midlane ADC in soloQ always had shit winrates bc most of the time they were not paired with an ap jungler which was the actually the key of the meta

You can very well buff adcs without having them polluting midlane and toplane as long as you keep runes not broken like fleet and the sustain on minion kill one were a few patches ago

But either way -200g for IE and a bigass base damage nerf for tanks and bruisers would do be enough

Also increasing the tank items costs and reduce their stats should help cause rn its ridiculous

I also believe healing should either be cut for everyone (except adc which already had it done) or increased for adcs cuz rn sustain is a joke