I'm thinking of the reason I reset my discord password
What made you reset your discord password?
Because I got a new phone so I had to move the account and apps.
That's as good a reason as any to change passwords.  In general, people should be changing them a few times a year anyways.  Otherwise you could get hacked!
Yeah. it's better to be more secure.
Do you use a password manager? It's a good idea to use one.