I set up a vacation message. How do I remove it?

See the following from Set up an automatic reply in Mail on iCloud.com - Apple Support

Stop sending an automatic reply

If you don’t set a date range when you set up your autoreply, you can turn it off manually.

1. In Mail on iCloud.com, click  at the top of the Mailboxes list, then choose Settings.
2. Click Auto-Reply, then deselect “Automatically reply to messages when they are received.”

Aha. Open the Phone app, tap Voicemail icon at the lower right of the screen, tap Greeting at the top right of the screen, tap Record.

Also see: Change your voicemail greeting and settings on iPhone - Apple Support

Real close now. That message I have for my missed calls. However, some of my callers receive a totally different message than the usual message of not being available. The other message reads “I am in Florida for the winter”. This message I made and activated, but cannot remember how or what is was. I am embarrassed.

Sorry, I don't know of any way that one phone line can give two different voicemail messages except if you are using Microsoft Teams.

If you are using Teams, the following may help:

https://support.microsoft.com/en-us/office/manage-your-call-settings-in-microsoft-teams-456cb611-3477-496f-b31a-6ab752a7595f

and the following which is old and may no longer be accurate:

https://answers.microsoft.com/en-us/msteams/forum/all/turning-on-away-greeting-in-voicemail/09cd6a47-b648-4717-a253-7b23a82254f7

If you aren't using Teams, have you contacted your cellular carrier customer support to see if they can help?