Have look at the purchase decision diagram
https://forum.fairphone.com/uploads/default/original/3X/8/8/88225e4e83185691a6fdae0b2b50e52947ed474c.png
or at the text version: Purchase decisions for FP3, FP4, FP5
Maybe you find an argument which helps to wait or to buy. If you want to buy a new phone and you can wait for several month you can try if a special offer or a discount action occurs at the FP shop.