My favourite top 3 perennials are Astilbe, Lady’s Mantle and Heartleaf Bergenia. They are often considered as old fashioned, but I adore them. They thrive well in a shade garden like mine. Here is more info about them
https://medium.com/@jessiealinari/three-shade-tolerant-perennial-plants-that-will-brighten-your-garden-88336d17783f
Heartleaf Bergenias deserve to be more popular as they have unique leaf form and beautiful flowers. They don't require much care, tolerate prolonged droughtр spread quickly ьха form a lovely dense cover.