This topic feels a bit weird… if you want to make the most out of a current setup, doesn’t that default to trying to be competitive? I’ll keep to your condition of keeping their prf weapons, and use budget alternatives for suggestions.
Thing I don’t like about this team is the lack of overlap. Most of the time, baiting this team only takes tanking two units. Adding rallies on the left and right frontline cav can allow a rally trap, but I’d prefer using lunges instead to make sure that everyone can take part of the action without having to rely so much on WoM while adding the benefit of allowing WoM snipes should the lunging unit allow it.
You’d probably prefer the healing tower doing the work for you instead of having Ethlyn use her healing. You can fix both of these problems by adding a healing tower (as mentioned, the shrine areas but also where the cav school is and the tile below Sigurd)
Speaking of the tile below Sigurd, a bolt tower hitting the entire team can be neutralized with a catapult in that spot. It hits a lot of buildings there and a healing tower on the right column can sort of neutralize the bolt tower problem.
Another problem with this map is… the map choice with regard to bad synergy when trying to overlap everyone’s attack ranges with lunges. It’d be fine on the right side, but unless Quan kills a baiting unit, the AI will usually prefer attacks that cause special effects or cannot be countered (healer staves are a really good example). Ethlyn would attack first, Quan next, and then that’s it. If the lava wasn’t there, the team would have more chances to follow-up from just lunges when set-up properly.
Silvia and Lewyn just… feel out of place. I think I’d prefer another offensive cav where Silvia is and a flying dancer where Lewyn is because flying dancers have access to aerobatics seal that’ll allow them to catch up with the cavs a bit easier (sadly, that’s just the Soiree dancers unless Ishtar and Rein aren’t in Genealogy, sorry I never played.) Even if you counter about Silvia’s HP to counter Isolation, she needs the defense mythic bonuses she can’t have from a team like this to do just that. If you don’t have a flying dancer though, just keep her as-is.
My final suggestion if you’re going with the lunge plan is to goad cav stack (but sadly that’s expensive). Ward cav stacking might not be as relevant since Flash+ is on Ethlyn but can be a decent alternative that allows you to put out more offensive skills if needed. Hones are weak to panic, but don’t worry about it since you’re not that serious about AR and might just run into panic manors instead of seeing Aversa supports (still hurts though)
Hope something in this big wall of text helps.