You can drink it, or you can adjust the taste slightly, but it will still be a little bitter. It is almost impossible to make wine without bitter taste, unless you add some additives to taste, but it is not healthy.

It is recommended that you add 34g/l white sugar to the wine on the 2nd and 4th days in the early stages of fermentation, when bubbles are generated. During the fermentation process, 34g/l white sugar can produce 2 Alcohol content means that you will produce 4 alcohol alcohol more than your natural fermentation.

Heating and then storing is correct to avoid continued fermentation and aging of the wine.