My big tip for someone at your stage: don't see the design. See a few designs. Sure, be going in some direction, but constantly be seeking alternatives to choose from. And always favor the simpler alternative to start.

One thing that helps keep me doing that: it's only with trivial problems that you know everything important up front. Accept that your domain will surprise you. That your technology will surprise you. That your own code will surprise you if you pay close attention to what's working well and what could be better.