If you want to have a consistent branding around the internet and you are lucky enough to get your unique alias on a service, never delete the account. Idle it, delete content if you feel it’s appropriate, but do not delete the account. You are not guaranteed that you can get it back again.
Unfortunately the issue of not-completely-unique internet aliases and unintentional account squatting is extremely familiar to me, and outside of scope for this post.
I also hope that by sharing my experiences here that I do not get people trying to be funny and register as me on different platforms, because that would be annoying, rude, and really not a kind thing to do.