How many pages of apps do you have?
I had about 7-8 and a few folders of apps. I realised recently my phone is sometimes quite unresponsive (iPhone 12 pro max) I thought it was just getting older.
I thought maybe I should delete as much stuff as I can. I deleted all the apps I don’t use and I’m down to 3 pages, I even deleted some of apple’s apps that come with the phone that I’ve never ever used.
My phone is running so smooth and responsively it almost feels new again and I mean that legitimately. I’m actually so surprised.