What would you use for your domain name?

I am struggling to decide. I have multiple domains. One for my username, one for my real name, one for a project I like to setup where I host different services for the community, and more :D

Now I want to build a portfolio or personal brand and a blog. Would you recommend to put it all under my real name or would you recommend to use my username? Or maybe separate the blog and the portfolio. The blog would go to my username and the portfolio to the real name.

Any advice?