I just wait for family or friends who are on contracts to upgrade. They’re usually pretty happy to let them go for a reasonable price. My partner just brought a 12 (I think) from her brother who upgrades every other year.

Honestly for me, if my phone fits my needs, I see no point to upgrading. I tend to steer towards iPhones for their long support and the “just works” aspect. I had an iPhone 8 until this year and only just upgraded to an 11 after breaking it. But each to their own, a phone is just a tool for me.