Q.Fertilizer
What kind of fertilizer should I use on my hummerbird summertime plant? Right now it looks pretty dead

A Hummingbird Plant is hardy in zone 7 and above.
Your plant may not have survived the winter if it was planted out in your garden.
If it was in a pot and wintered over in a sheltered area or indoors, the roots may still be alive.
You could prune away the dead plant material and see if any new growth appears.
Fertilizer is not required for this plant.
This article will help you.
https://www.gardeningknowhow.com/ornamental/flowers/hummingbird-plant/growing-hummingbird-plants.htm