try to get into an 30years + range guild
those are more casual and not so "competetive"
they come with the downside that they are not pushing rating that often, so keep that in mind if you want that
there are very active guilds with tryhards for that, but thats another story
search on the bnet site or spamque m+ looking for premade guild groups and get into a conversation with them
also, bit more information would help too. pvp/pve - NA or EU, language, main focus of gameplay ++