You could do a betta community - a betta, pygmy cories and smaller tetras/microrasbora such as embers, galaxys, etc. Or a large group of smaller tetras. Or divide it up and keep more than betta, or a female betta community. Dwarf puffers or killifish are also options. There are a fair amount of things that would work, I'd look around and see what fish you like the look of then share your thoughts
thanks people i already have a betta, and im having a few problems with it which has kinda put me off them, i like the cardinal tetra and head and tail light tetra also i've kept some of the trigonostigma species mainly hengeli and espei and they looked great in large numbers but im wanting something different