Season seven of DS9 would have been so much better if the Dominion war had ended at the end of season six. They could have moved on to other matters and story lines.
Season eight. Would have loved it if TPTB had largely jettisoned the Dominion, the Cardassians and the Romulans. Dealt with the after math of the war on the characters, and the Federation.
Supposedly the original plan was to finish up the Dominion War arc in the sixth season. But when Worf was foisted upon them for the fourth season, they felt the need to include the whole "Klingon tensions" subplot that went nowhere.
Honestly, I think they could have used a post Dominion War series mainly because it was really clear they had no idea how to properly conclude Ben's arc. What we got in the final episodes involving the pah wraiths was flaming hot garbage. I'd like to think with a season of just dealing with how to conclude his arc (which would include Bejor joining the Federation!) we'd find out he was destined for something greater than tackling Dukat when he's holding a book and pushing him into a lake of fire.