My handle has been pending for over a day, and I was wondering if there was any reason why or anything I could do to fix it. Thanks!

Your account shows as a potential multi so an asim will need to check you out manually.

That's my fault. I had an old account (Monty Calaber, I think) a while ago. My character died, and I tried to make another character. That didn't work, so I recently made an entirely new account (this one). I've been looking through the website the past few days, and realized a) There was apparently a button to show multiple accounts per house that I missed, and b) The reason my old account wasn't working is because I tried to use the same handle as before.

If you remember the email of the old account you will need to request a lost password. If you don't remember or don't have access to that account you need to file a support ticket with as much information as possible at the Contact Support button at the bottom right of this page.

I think my only problem now is that I have two accounts, so is there any way that one could be deleted or forgotten?

Yes, file a support ticket so an admin can handle it.