No Available SATA Power?

I bought the pre-built homelab server. I need to use some SATA power for other devices I want to hook up, but I see all 4 of the SATA power connectors on the power supply are used up to power the backplane?

What are my options to free up a SATA power connector?

If you are planning on filling up all the hard drive bays then you’ll have to upgrade the power supply. I recommend the RM850x at minimum - maybe the RM1000x depending on your plans.