Coming at this question as a member of Lemmy-at-large, and neither a vegan nor a member of your community:
(1). As your community gets larger and more active, more people will choose to block your community rather than downvote everything from it. Also, with more members their downvotes will matter less.
(2). Move your community to a different instance that is more favorable towards Veganism, such as Slrpnk or Hexbear, or self-host. Some of these instances even turn off downvotes.
Coming at this question as a member of Lemmy-at-large, and neither a vegan nor a member of your community:
(1). As your community gets larger and more active, more people will choose to block your community rather than downvote everything from it. Also, with more members their downvotes will matter less.
(2). Move your community to a different instance that is more favorable towards Veganism, such as Slrpnk or Hexbear, or self-host. Some of these instances even turn off downvotes.