Fish the margins is my advice. Bait up regularly and get them confident on feeding on your bait and a spot.
also remember these fish live in the lake. They are used to the depth. They will feed on the bottom in 25ft.
I’ve had relatively unpressured fish on boilies, hi viz pop-ups, etc. just prebait consistently with the same bait.
I don’t know where abouts you’re based but normally the deeper lakes work on a different time cycle, they’ll be a month or so behind everywhere else. The fish will wake up later, spawn later and the water temps will stay higher late in to the year.