The ACC can't raise it's ceiling (unless it adds ND), but it could raise its floor. Work on a partnership with the B1G - set up as many permanent/semi-permanent cross-conference rivalries as possible. Something like Pitt vs PSU as the first game of the year each season for both teams. Ohio State vs Florida State, Clemson vs Michigan, etc. With an expanded playoff and automatic bids, there's not as big a penalty for scheduling tougher non-conference games. If they can drop a few teams, that's even better. They may not get Texas vs OU, but at least they can avoid Wake Forest vs ... anyone.
The irate 8 could go the partnership route as well. Ditch the Kansas schools and Baylor (because fuck them), add whoever makes sense from the AAC to get enough decent football programs (Cincinnati, Houston?). Then use Texas and OU as leverage to get the SEC to commit to a long-term partnership. Texas and OU get to leave at the end of the year in exchange for the SEC dropping its late season FCS games to play teams from the new conference. Texas and A&M would still be playing the Texas teams every now and then anyway and I'm sure OU will still play OSU so its not a huge ask. Arkansas and Mizzou probably wouldn't mind an extra Texas game every other year. Promise the new conference 6-10 home/away pairings each year and the value of the conference goes up while the SEC gets recruiting trips to Texas and better non-conference scheduling. Do the same thing with the B1G by taking advantage of geography to get deals with Ohio State, Oregon, Nebraska and anyone else that wants to recruit Texas. The big name schools get regular recruiting trips to Houston/DFW and the new conference get's high-value TV games.