Time for a serious answer apart from airing reruns from the 1990s.
I would send Al Jean packing, make Matt Selman showrunner going forward, compress the current writing team down to Selman, J. Stewart Burns, Carolyn Omine and John Frink, offer spots to Matt Warburton, the good ex-Futurama writers (DXC, Vebber, Weinstein... NOT Ken Keeler) and the good ex-Office writers (Greg Daniels, Dan Greaney). Everything else would be farmed out to freelancers (i.e. no more scripts being written by Dan Castellaneta).
I would then send this crew to a cabin retreat for a week to rewatch Seasons 1-3 and drill into their skulls that I want more of the emotional core from those episodes integrated BACK into the series framework. I would also scrap the 4-act system and revert back to 3 acts (same number of commercials, though - just let the episodes pace themselves better).
I would also designate a hard-end date to the series after working out one final extension with the VA talent and ensure the final season (whether it wound up being Season 26, 27 or 28) had a moratorium on new guest star appearances - only people with established characters would be invited back to voice them. That final season would bring in a who's who of classic era writers (i.e. Vitti, Swartzwelder, O'Brien, Jean & Reiss, etc.) to write one last episode each and I would have the last episode with a cliffhanger that would lead in to a 2nd movie that would air in theaters that summer.
Then I would push for the launch of an all-Simpsons cable network and release the entire series, 2 movies, 48 Ullman shorts, commercials, animated material for the video game, whatever else you can dig up in an ultra-deluxe BluRay set for collectors.