enemy team has a full on wombo combo team no adc either what to do?

You get Shen, Tresh and Graves to build extremely tanky. without an ADC the opposing team should not be able to kill all 3 of them using just their combo.

Merc Treads, banshee's veil. Never clump up.

if someone on your team can 1v1 everybody on their team he can splitpush.

If not, look for picks with thresh.

if teamfights happen, wait to go in after they used everything, and do kata stuff

Split push all lanes- comps like this usually don't have the ability to 1v1 or 2v2 as well as a meta one