

Install GrapheneOS (consider this device as insecure as Google dropped support) and some minimalist launcher such as Olauncher, Unlauncher or mLauncher through Droid-ify (or another F-Droid client of your choice) or directly from source. You can also install digital wellbeing apps such as Mindful, DigiPaws, GreaseMilkyWay or Regain (that last one is proprietary and is available on PlayStore (or AuroraStore)) to help you have better control over app such as YouTube.
For YouTube you can also install some FOSS client such as NewPipe, Tubular or PipePipe etc…
These are minimalist dumphone-like launchers