I've had shade garden for years. Every year shade has to be checked to be sure trees havent over powered the area. Limb up, cut down.
First, you need to check into what grows well in your zone. Your local garden center will be able to tell you the best plants for your area and how to arrange them in a pleasing way.
I’m in zone seven — heres some of my favorite perennial shady site choices.
Coral bells, astilbe, pulmonaria, hosta, lily of the valkey, hydrangea are some of my favorites. Be sure to check with your cooperative extension local master gardeners are there waiting to give you advice, they also may have local plant sales, My local MG office of the coop extension has plant sales twice a year. Acquiring plans directly from a local garden is easy way to acclimate to plants vs an imported greenhouse variety from a big box retail store.
Your selections for your situation would depend on your planting zone soil conditions and lighting situation, colors and textures that you like. In my case coleus will not overwinter and is considered an annual.
A great resource is your local Cooperative extension. These offices are manned by a wonderful team of master gardeners that know your local situation quite well. They can be contacted by personal visit, phone call or Internet. Consider googling up your local extensions office. They are there waiting to lend their expert advice. Volunteering back hours and community outreach and education is part of maintaining the Master Gardener accreditation. Consider helping out the MG by allowing the MG to help you.
There's also email ( submit a photo) Q&A resources that have helped me many times.
Heres a link for your consideration. Hope this helps.
Your local nursery can give you all kinds of plant options that will grow well in shade.