Having lost 3 based TCX frames and 3 based EZY frames in recent years, I reckon there would be space to add another overnighter or two, and if the airline offered, they’d make it work.
Another LS 738 would bring about an extra 14 weekly flights, give or take. And I reckon off the top of my head I could rattle off about 10 brand new routes that they could take their pick of to serve from here if they wanted to.
In the medium term, providing things continue as healthily as they seem to be, if overnight stand provision is becoming an issue, the airport are going to want to start thinking about how they address that. I can really see a market for at least 5 based frames from Ryanair by the end of the decade, and at least another aircraft each from Jet2 and TUI.