Endgame investments

I’m going to preamble by saying I am not an endgame player (at least, I don’t regard myself to be) and firmly believe I’m still a mid-level player looking to develop some endgame things early on (I’m level 77, current investments are approximately 355G net worth roughly 225G). I’m more curious than anything, while one should strive to make investments as high as possible, what is the approximate benchmark for an endgame player when it comes to investments per building? I’ve been gradually targeting 2,000 invests per building, but don’t know if that’s enough or if it’s too much. What are your thoughts?