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Maybe a place where people can create profile pages share their usernames (handles) on different social media sites (like about me but for your usernames), or a less technical keybase reference page for all your online presence.

It was previously a place to buy and sell usernames, but I wasn't too crazy about the concept, I think there's possibly more potential elsewhere

Gravatar competitor

Most obvious one would be a username "availability check" service.

A lot of people recommending this (off HN) but I feel like there's more potential elsewhere

Also avail check probably not best for monetization

Find a cloud identity provider that wants to rebrand.

Keycloak-as-a-Service

I can build it for you if you like.

Sell usernames as NFTs.

How much?

How much would I sell it for?

Just bought Usernames.com