You mean on the yard-side of the sidewalk? It’s hard to tell if there’s any planting room on the house-side of the sidewalk (if there is, it’s likely too small to support much).

Since your house is on a raised foundation, I think I would look for flowering shrubs to plant, but they must have a mature height about 3’ or so. Any taller and you would be constantly trimming them down. Since I’m in the midwest I can’t give knowledgeable advice on specific shrubs for you.

This is the time to hire a landscape designer, or enlist the help from an independent ( not HD or the like ) garden center.