I don't even have a case on my phone right now because I know I can just replace it from Swappa for cheap. Thank goodness for people like OP who keep buying brand new phones and giving up most of their value.
And what I do on my phone is some web browsing, email, chat/messaging, YouTube, navigation etc. which has been a completely great experience for many generations. I don’t have any slowdowns on my iPhone SE 2020 and I only upgraded because the 2016 used SEs had bad long term batteries which would die on me.
Swappa looks interesting. I used to use Glyde some years ago which looks like the same concept. Then one day Glyde was gone. I bought and sold a bunch of tech stuff on there.