How do I know when I can increase my DM limit without entering the spam thingy? And how do I know when I've reached my DM limit?

Hey guys I need some help, my target audience is fitness studios that offer classes (Pilates, HIIT, etc...) but I'm trying to think of a better offer than a "Free Class" because that sounds lame and it might attract the wrong type of people. I was thinking something like 28-day transformation challenge/program but usually, these studios only offer the training part, they don't offer nutrition and accountability which is usually the bigger part. Any ideas? I heard about the 6 week challenge doing amazing but it's the same thing as the 28 day challenge - they don't offer the bigger pieces (nutrition and accountability)

4 weeks ago my client had a webinar, 70 people showed, closed 7-8. 2 days ago we had another webinar, 155 showed, closed 0. He told me he didn't change anything in the webinar and the results just really surprised me... What should we do? Is this normal to have?

*Shouts to media buyers with good experience* I had 3 separate ads, each ad in an adset for itself, they were performing good but I had to turn them off because the event we were advertising for ended My question is: do I just turn the adsets back on? Or should I make new complete ad sets and put the same ads in them?