You could do a community tank with some tetras (cardinals, rummy nose, etc), cories, loaches (I like yoyo loaches, so I'll recommend them), some peaceful cyprinids ... I have SAEs, rose line sharks, and pencil fish ... and maybe some dwarf cichlids.
And if the betta doesn't survive all of those guys, at least you'll have a lot of nice little fish to look at and keep you happy
And if the betta doesn't survive all of those guys, at least you'll have a lot of nice little fish to look at and keep you happy