Currently Own iPhone 8. Upgrade to 15 this Year or Wait for SE Update?

Hi! I currently own an iPhone 8. It's treated me right for a long time. I really value a smaller phone size and don't know how much I will like having a larger phone in my pocket, especially on bike rides or while being active. Since Apple announced future updates won't support the model, I am looking at upgrading this year to a 15 or next year to an SE. Thoughts?