Look up " The Pearson Square " wrt wine making .
It is a simple to follow diagram that takes in the natural sugar content at a given temperature and what additional sugars you need to make a given alcohol by volume .
What will you be using for your sugar content , honey, cane sugar, beet sugar , brown sugar, grape juice, natural pure un adulterated fruit juices , banana pulp ?
You might also consider a lower tolerance alcohol wine making yeast .
They used to be available as dried packet yeast sachets from 5 % ABV right up to 21/ 22 % ABV ( a TOKAY wine yeast ) .
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You'll need a decent wine hydrometer & an accurate temperature thermometer as a well so you can get the correct temp and specific gravity readings needed for the Pearson Square information for the final ABV ( alcohol by volume ) desired
You could go for as low as 5.5 % ABV but it tends to go off within a few months , a slightly higher level at 8% ABV seems to be the magic alcohol level that preserves and enhances the wines with ester alcohols etc. .