How do I speed up the last AV floors (5 to 10)?

!We’ve been playing this campaign for over a year now, and I’ve had to modify a lot of it. I brought in the AV expansion content and added tons of RP (for example, going to Absalom for the book turned into a 10–15 session act because everyone was having a absolute blast with it).!<

!The thing is, we tried AV because it was on Foundry and people said it was great for beginners. Honestly though, neither my players nor I are really enjoying this megadungeon. I want to wrap up the campaign quickly without making it feel rushed. They're still in Absalom right now, and when they come back they’ll be heading into Floor 5, where I also have a lot of custom content planned around the arena to make it more RP-heavy.!<

!I haven't read the lower floors yet (7-10), so I’m not sure how I’ll handle them or if there’s a way to skip any of them entirely. I’ve already heard about cutting down on combats and I'll definitely do that, but is there any specific floor or content that can be dodged completely? I don't want to just abandon the campaign either, since my players really want to defeat the BBEG and are too attached to their characters to just drop it.!<