I made a bunch of mobile games with Unity that worked as a porfolio for Unity Development jobs. I had been wanting to transition into more traditional software development, and I was fortunate enough to be able to learn a front end stack at my previous job. I made this project over nights and weekends, and it was a significant factor in me getting my current job doing react development:

https://bitmelo.com

My best advice would be to try to make projects that are undeniably good. So good a company would be dumb not to hire you. Def easier said then done though.