"I am still quite satisfied with my iPhone 12 Pro Max" That is your answer right there. If you are happy with what you have, why spend a couple of thousand dollars on a new phone? If you are ok with burning money for no reason other then a very brief dopamine high when getting a new device, and the depression that comes after when it really does not change your life for the better at all and you continue on with your upgrade anxiety.
If you are worried about support being dropped you can buy at that time when support is actually dropped. What are you really getting with a new phone, the biggest thing is a better camera, though the cameras have been pretty amazing for a while now considering these are cameras on a phone! You will have some apps load up a little faster then they already do, and the screen resolution might be a bit better. AI is a big thing, but for many I think it is just a gimmick that at the moment is not going to change much for day to day use. Stick with being content, keep your hard earned dollars or if you really want to spend give to a charity."I am still quite satisfied with my iPhone 12 Pro Max" That is your answer right there. If you are happy with what you have, why spend a couple of thousand dollars on a new phone?