Just last weekend I had my county forester out for a little tour of my land and this exact subject came up. FWIW, my spot is about 5-6 acres of black ash that got beaver-killed before I bought it.
Beaver issues are solved now but it’s still quite wet in there. No go without hip waders.
Anyway, he said if I just leave it alone the tag alders will dominate and maybe some young black ash and tamarack will come back.
Since it’s bordered by white cedar, it will likely seed into the area. Approximately 60 to 100 years after I’m worm food
His suggestions were to plant some native shrubs on the few small dry areas and edges and possibly shear the existing tags first for regeneration.
He didn’t think spending time planting actual trees would be worth it because of how much the water table fluctuates….even without the beavers.