My advice - sell the car immediately to Motorway for £16.5k. This is a really good offer considering you can buy hundreds of 2022 1.0 Focus' estates from a Ford main dealer for around £16-17k. I just did a quick bit of reading and can see that on a personal loan you can pay off £8k per year without fees? If that's correct and how I've understood it, pay off £8k as soon as you sell the car, and stick the remaining £8.5k in a 5% savings account until March 2024 when you will entered a new year on your loan, and pay off another £8k. Yes it will mean that you have some £6k to pay off on an asset you don't even have, but unfortunately, that's the cost of A) taking out a personal loan at such a high rate and B) buying a 1 year old Ford Focus which are well known to drop like a stone in value C) buying a newish Ford, in the most expensive way (main dealer), at a time when the car market was the most overvalued in the last 20+ years(?). You were already in negative equity the moment you shook hands on that car, which has been further compounded by the car market crashing, especially in the segment you bought from.
However, I'd rather have a relatively small £6k loan hanging over me (which although is still at 10%, will drastically reduce the amount of money you're paying on interest), rather than an estate Ford that's crashing in value, and a £22k 10% loan hanging over me.
You could even look to pay off the remaining £6k, assuming you have some savings, and see what the early repayment charge is. If it's not too bad, this would be your quickest way out of this.
As a side note - I'm sure you may have an inkling, but you are utterly terrible at buying cars or managing finances. In the future, you should only buy a car following written approval from a committee of responsible adults. You should never take a loan out again unless approved by a responsible adult. And you should start looking at some nice £5k cars to tide you over for the next couple of years as you recover from the financial bumming you have given yourself over the last 2 years.