The smell of mash and yeast in young homemade wine is normal. Further exposure in the cold for at least a couple of months and periodic removal from the sediment will solve this problem. The main thing is to adhere to the recommendations from the recipes on the site.
If an already aged wine smells like yeast or mash, it means that mistakes were made during the preparation process. To remove an unpleasant smell will help “airing” https://alcofan.com/zachem-i-kak-provetrivat-domashnee-vino.html and “lightening” https://alcofan.com/osvetlenie-ochistka-domashnego-vina-%E2 % 80% 93-8-effektivnyx-metodov.html