Being “available” 24/7 doesn’t mean you’ll be “working” 24/7.
Personally, I’m available 24/7 minus the time it takes my body to do that “sleep” thing. I have the awesome Fiverr App, so I’m even available on the go.
Also, all of my orders have a 24hr turnaround for any job that takes me 4hs or less to complete.
That doesn’t mean I’m working every waking hour, but that I’m good at organizing myself. I may get an order at night just before I’m off to bed, check what’s involved and plan appropriately to deliver within 24hs.
I also make good use of the “VACATION MODE” in case I see I’m getting overwhelmed. Worst case scenario, I end up working 12 hours one day because a lot of orders arrived while I was sleeping and I didn’t get to activate VACATION MODE. But that’s never happened to me so far unless I planned for it.