You could install LineageOS on your existing phone instead of upgrading. The OnePlus 7 Pro is supported. The install process can be daunting depending on your technical skills, but it’s a one-time process since the phone gets updates over-the-air after the OS is installed.

I did this with my OnePlus 6 a few months ago and the experience has been good. Switching to LineageOS bumped Android to version 13, whereas it was stuck on Android 11 on stock OnePlus firmware. I’m getting regular updates again, including open-source Android security patches. Not everything gets patched though, some of the core firmware is proprietary to OnePlus and that cannot be patched by anyone but them. It’s letting me extend the life of a phone still works well and has a 3.5mm headphone jack.

A lot of people won’t like this answer, but I would not recommend anything from Samsung. Yes, the hardware on paper is typically excellent. However, everything else that comes with the experience is a complete joke to me.

• The bootloader is locked, and even if you manage to get it unlocked Knox will be permanently tripped.
• I never personally liked OneUI, but accepted it as long as it works. Unfortunately that’s also not been the experience for me.
• The last update they pushed for my phone broke Bluetooth connectivity, and it’ll never be fixed, because they said there won’t be any updates period. Now I’m left with a pen notification that never goes away, and a watch that disconnects every 15 minutes.
• Their own stock apps are not very convenient at all, but don’t forget to remind you to sign up for their updated data theft EULA every time you open them

And that’s just software. It doesn’t stop there. On my Note 10, the glass back completely peeled off, because of internal heat, and the only thing holding it together is the case. Keep in mind that this is from just regular usage. I don’t play games on my phone, or do anything else that would warrant this kind of output