I can also attest to removing non-essential apps and using my original iPhone SE in grayscale mode to make it less appealing to distract myself with social media etc.

I don't know what I'll do when this phone dies. I need a modern smartphone for cellular connectivity, messaging applications, photos, and music. But I can't bring myself to buy a giant screen, 6GB+ of RAM, and lose out on features like the headphone jack and my fingerprint reader that serve me well every day.