I try not to start personal projects or experiments unless I feel they can grow into an interesting case study. A case study is a system with its own logic, meaning, story, goal, and solution. Adding it to your portfolio will definitely attract more clients than isolated hero images or random fragments and experiments
Here's some early brand identity work for the NOVA-1 jet racing teams, namely the concept I made for team Quantara and a few bits of design I’ve put together for them