Looks much better than a typical beginner, congrats. As someone with a bit of experience (and a degree) I'd just suggest that you avoid breaking up the ground plane so much. It's the single most important rule for PCB design. Traces on that side should only be short links to jump around a trace on the top side, where possible. It matters the most for SMPS, RF, etc.

This is how it starts my friend. Before you know it you have a lot of projects 90% done and living in production without ever getting the last 10% before you think of something new! Currently I'm refactoring a lot of homebrew ESPhome devices to use the ESP32-H2 as it supports Thread. This allows me to remove weak IoT SSIDs while expanding my Thread network node count for better mesh.