Should I upgrade?

I'm having my iPhone 14 Pro Max since 3 years now and i'd appreciate something new. Back glass is broken, Battery at 74% capacity and it sometimes has bad WiFi alltough my connection is pretty good here in Switzerland. It freezes in-app more and more overtime and becomes annoying.

My Question:
Would you buy a new iPhone 17 Pro Max or wait till the newer iPhone 18 Pro Max comes out? What are your expierences with the iPhone 17 Pro model so far? I think its pretty decent (esp. RAM upgrade) and very nice to look at.

What would you guys recommend me to do?