It's not the shade that's the problem--many, many great plant like shade. It's the fibrous roots that suck all nutrients and water from the soil. It's practically impossible to grow much under a maple, and some types (Norway and Silver, for example) are worse than others. You might try establishing Liriope spicata (a spreading, rhizotomaceous type), not Liroiope muscari. It will be slow, but it might make it.

I have had very good success growing flowering plants under a 60 year old Maple. The catch is to have early bloomers for before the tree leafs out. Early Azaleas and Early Forsythia , crocuses and squills come to mind at first. From there, I have Comfrey, Hosta and bleeding heart growing quite well later in the year. Of course the perennial Dusty miller and the annual Impatiens.

The shadows in my yard limit the north bed to about 2 hours a day of sunlight later in the year where I have daffodils, tulips, turtle head, hellebore, and Solomon's song (?). For larger plants: Lilacs, wisteria, Azaleas, both early and late Azaleas, and Early Forsythia, Sedum, and Epimidium I forget which one),

The only problem I have now is that the roots prevent my digging them in.