I wouldn’t give up yet. I would rack it to a smaller carboy Or top it up with a similar wine ( this is controversial and a personal opinion but a similar wine would be pretty easy .. yes it may cause the flavor to change a little. So that decision is yours. I would buy some potassium metabisulfite (k-meta) and dose it with a 1/4 tsp when it is racked. I would also put an airlock on it. In case it does still ferment a little. Be sure to put some form of a liquid in the airlock. Again this is a personal preference. I have used vodka, plain water, and a solution of k-meta all with equally good results. It is no where near ready to bottle or sweeten at this point.
When I first started making wine, I did some cheaper kits to get the hang of it. I read a lot of information. And asked a lot of questions. The good thing about the kits is all the additives are in them. I also recommend sticking with the kit instructions and not trying to increase the ABV % until you have a better handle on the process. Kits can be quick drinkers too. Like a wine expert island mist. So you get some faster gratification
Hang in there. It’s hard in the beginning. But keep at it. It is a very rewarding hobby.
Cheers