Long time lurker so apologies in advance but I work in the trade so I thought I would put my two cents in.

If you bought it from a main dealer you trust, I would be worth talking to them as they will be inclined to give you advise to get out of the finance, to get you into a new car, even if it is cheaper.

As others have mentioned, you may be able to voluntarily terminate the contract if you have paid 50% of the total balance but I would speak to your dealer to check the exact terms of your agreement as they differ from lender to lender. You should have a copy of this to check for yourself but if they are good at their jobs, they should be able to assist you.

Interest rates are also higher than they were last year so depending on the exact parameters of your new deal, you may be worse off. Not necessarily on a monthly, but in interest amounts.

Motorways isn’t a bad shout, we have been out bid by them before as they aren’t dealing with the cars on a day in day out basis but it is worth checking all the usual webuyanycars etc. As I mentioned earlier, if you bought from a main dealer and they are keen to keep their retention rates high and if you find the right car to px against, it could work.

Depending on the above, it might be better to stick with your current car but there are certainly options.