What camera do you use?
At the moment I shoot with a Nikon D850. I like it because it brings together everything I look for in a camera: incredible detail and image quality, good ISO performance and color accuracy. I do wish it was a little lighter though!
For the non-pro photographer I would avoid getting caught up in the endless cycle of newer and better gear because I think that misses the fundamental point of nature photography, which is just to get out and experience the beauty and wonder of our planet, and to share that beauty with other people. Sure there might be cameras out there with better dynamic range than your current camera, or more detail, and better high-ISO performance, but for 99% of what the average person shoots almost any camera is sufficient. Plus ask yourself if you’d rather spend $3000 on an international photography excursion or on a new piece of gear.