You can use the search feature of Discord to find groups you would like to join.

It is for me hard to valuate groups in context how good they are so that is something you need to do yourself.

Here is a URL to Discord with search of "fishing". I hope you find what you are looking for. https://discord.com/guild-discovery?query=fishing&offset=0&limit=12&preferredLocale=fi&categoryId=-1&tag=
spam fails_task lang_mismatch pii not_appropriate hate_speech sexual_content quality toxicity humor helpfulness creativity violence