What can I add to my 75 gallon tank?

[u/OkInitial5267]

I have a 75 gallon "decorated" with driftwood, fake plants and gravel as the bottom, but it's really empty. In this tank, I have 8 giant danios and a (baby) blood red parrot chichild. I'm not sure if I should wait until I get a larger (and less boring) tank for them, but it'll be a while until I can do that. Or if there is anything else I can put in that tank to make it a little more lively. Anyone have any ideas? I'd like it to stay decently low stocked but I'm open to all ideas.