Maybe allow users to shorten links for free (without account) so that your domain becomes recognizable. bitly became popular that way

And target enterprises with custom URL's. They look very good

Maybe copy some features adjust has (deep linking and redirecting to respective app stores with tracking parameters)

https://www.adjust.com/glossary/deep-linking/

Without account, shortening invited spammers and lead to security concerns and it was difficult to deal with that.

Businesses that I target have set up custom domains and reap more benefit from it.

I eventually plan to retire default shortening domain(blanq.io) and only offer custom domains.