I would rehome the danios. They like cooler temps and a good 3ft minimum tank for plenty of swimming room. I must've missed them when I read your list first time.
I personally would rehome the majority of the guppies, the peppered corys, danios and loach, and then you could perhaps introduce a small group of neons or other small tetra/rasbora.
NB peppered corys are also a temperate cooler water fish, which is why I suggest removing rather than adding more.