Welcome!
You have a blank slate. There are so many choices!
Cichlids have wonderful personalities and are quite interactive. The choices are endless from a single tank occupant or a group of smaller types. Some that I find interesting as a solo fish in a 75g would be a Green Terror, Midas or Red Devil, an Oscar just to name a few. A group setting could include a Convict, Firemouth, Jack Dempsy.
Again welcome to the forum and have fun with your tank!