Following on
@Ajmassa's post, I can think of 5 ways to produce a sweet wine:
1) ferment the wine dry, stabilize, and backsweeten. This produces whatever ABV is desired and the residual sugar is whatever the maker desires. This is the recommended solution as it has no drawbacks.
2) add spirits (brandy, vodka, Everclear, etc.) during fermentation to increase the ABV above the level the yeast can survive. This produces (more or less) a port wine of high ABV, although fermentation will not stop instantly so achieving the desired residual sugar may not work.
3) use a low potency yeast and start with more sugar than the yeast can survive. This can produce a lower ABV than #2, but yeast potency is not an exact value, so the ABV may be different from what is desired, and the residual sugar may not be what is desired.
4) ferment the wine to the desired residual sugar and sterile filter to remove the yeast. Commercial wineries sometimes do this for dessert wines. The drawbacks are you'll be filtering fermenting wine and will plug up the filters fairly quickly as filters available for home winemaking are for polishing. There is also a question if the "sterile" filters available for home winemakers adequately do the job.
5) use a commercial centrifuge. A local brewery uses that to clear their beers. Getting access to one is probably impossible.
The advice generally given on this forum is to use #1, since you are in control of the outcome. #2 and #3 work fine when you have many barrels of wine and can blend to achieve the desired result. When making a single carboy, not so much.
What is your reason to not backsweeten?