PSA for everyone on Mastodon: You don't need to use link shorteners. All links count as 23 characters, no matter what.
All a link shortener does is keep people from seeing where the link goes*. Many of us will refuse to boost posts with shortened links precisely because of this.
Please, just put the actual link in your post!
* And make your link become useless if the link shortening service ever goes away for any reason.)