One place to get started might be the Alliance of Independent Authors: https://www.allianceindependentauthors.org/ https://www.allianceindependentauthors.org/

One place to get started might be the Alliance of Independent Authors: https://www.allianceindependentauthors.org/ https://www.allianceindependentauthors.org/ They are author as opposed to translator-focused, but maybe reaching out to them can be a first step in getting the lay of the land? They might have some information about how their authors tend to use translation services. Although I'm sure there must be some translator communities out there that could provide even more focused info.