Just be careful about "deleting" your Yahoo account.

> Register a previously used ID

> A deleted Yahoo account ID may become available for future use, and you’re welcome to try to register it. However, Yahoo can't specify how long until a deleted ID may become available, and we can't guarantee that it will become available.

https://help.yahoo.com/kb/SLN3060.html

And make sure it doesn't get removed for inactivity:

> If you rarely use your account, it will go into an inactive state and then be deleted. You can prevent this by signing in to your account using any device at least once every 12 months.