I just started building my developer portfolio. Part of it, I have created a web page and hosted on GitHub Pages. Check out my devloper landing page here.
Also I started contributing to the open source community. Started with Hacktoberfest. I have completed 5 PRs and waiting for my T-Shirt :)
You can have your own blog or start writing on blogs like Medium or Hashnode. I have written my first Medium article in Nov 2018. you can find it here.