32k Instagram Account Help

I have account with a decent amount of followers... 32k in the animal niche. Sucks I'm running out of pictures... Where can I get some unique pictures? Fiverr? If if I have to pay that is fine. Also, with how many followers should I start to monetize my IG. I get about 2k-4K likes per picture.

Any suggestion on the above and what would be the best way to monetize this niche? Thanks