For Apple, it’s not just a phone...
You are going into a new eco-system.
When I got iphone 6plus ...more than 4 years ago.... I had bought a lot of movies, songs and some paid apps...
It can’t share with android system...
Therefore for short period of 1 year, I don’t recommend Apple iphone, please stick with android phone... it is much easier to migrate.
Your Samsung S9 can go to those shops to replace screen and battery... I think less than $200/-
If die die want to get a new phone... look at mid-range Samsung A51 ... at least you still can use back the Samsung cloud.