You could use this area for seasonal flowers. It would be helpful to see the entire yard to choose something that will go with the existing landscape.

It looks like you already have attractive low maintenance plants that haven't gotten overgrown. This seems to be a rather narrow space, so I don't know if there would be enough space or sun for lavender plants, but they have some pest repellent properties. They need full sun and they grow 2'-3' tall. How wide is your space and how much sun does it get?

I think a variety of flowing grass , blowing and arching over walk will soften the space, maintenance free and many lovely colors to blend together

I know nothing about plants for Florida, but I do know that in my zone that very narrow spot really couldn't support anything much more than sedums and possibly muscaris or liriope. It's just too narrow. And what's there now is quite unattractive.