Fish anything that helps to raise the temps of the water.
Shallow water
dark bottoms of the lake, depends on the lake, could be muck, sand, gravel of small size ect.
Fallen timber.
Weeds
shallow water with mixed bottom types.
Good luck and every lake is different, alos try the breaks near post spawn and pre spawn, we found crappies last day of ice fishing on a flat postioned between the deep and shallow water.
Deep 21 fow shallow less than 5 fow!