The large shrub in the middle of the house is really badly placed.

Yes, please kill the burning bush. It's the wrong plant for that place plus it's highly invasive in North America.

Think about replacing the hydrangeas with several small evergreens. Then your perennials will be planted in front of the evergreens.

Phlox might appeal to you for big fluffy blooms.

Try ninebarks. Also, you could try lacecap or oakleaf hydrangeas. Or viburnums. Arrow wood Viburnum has blueberries, so along with flowers in the spring, you get some of that blue look later, when the berries develop.

The facade of your home is lovely. I would stick with low growing shrubs and perennials to keep it visible.