I mean this cant be that niche surely?
- Screen no larger than 5.8"
- headphone out
- android
- 6gb ram+
I'm still using a nexus 5x but cant seem to find an appropriate phone to upgrade to
Grab the dimensions of a reference phone, rather than the screen size, that's the size you want and chuck that as a maximum into GSMArena. This gen has a huge push for high screen to body ratios which makes screen sizes a poor comparison vs what you'll be upgrading from and this also means that regular size phones have larger screens.
EG:
Galaxy S10, 6.1" screen (93.2 cm2) 149.9 x 70.4 x 7.8 mm
Galaxy S8, 5.8" screen (84.8 cm2) 148.9 x 68.1 x 8 mm
Galaxy S10e 5.8" screen (82.8 cm2) 142.2 x 69.9 x 7.9 mm
The 6.1" of the S10 is closer in total dimensions to the 5.8" of the S8 than the S8 is to 5.8" S10e.