I do think it’s difficult to find the more social guilds, simply because they don’t often have as much organisation or impetus to find new players by posting on forum sites. Generally guilds who are actively raiding are much more likely to post recruitment adverts.
However, just because a guild raids, doesn’t mean they don’t have a social aspect too … it’s just a matter of digging through the info on them to find out if they do, or if they’re one of these guilds where people only log in to raid.
Also … it’s difficult to find guilds where everyone is levelling at the same level as you … because generally levelling is fairly quick, people level at different paces and it doesn’t take long for people to end up at completely different levels.
What you probably need is a guild (or a community) that has people who enjoy playing lots of alts. That way there’s plenty of experience of the different classes, and plenty of experience at levelling - plus, of course people with alts at different levels.
You also have to take into account what you’d like for your WoW future. Would you definitely rule out raiding? Or would you like to give it a go? Do you want to spend a lot of time PvPing? If so, what type?
Basically … work out what YOU want, and then start asking around specifically for that. Take your time and don’t be hasty … some more established guilds will often have websites and/or social media - check those out and see how active they are, and if the activity is relevant and of interest to you.
The likes of wowprogress are probably not very helpful for you, because they’re very raiding focussed … but if you are on Facebook you could check out the EU WoW group: https://www.facebook.com/groups/OriginalWoWeu/
Also make sure to check out your Blizzard realm forums : https://eu.forums.blizzard.com/en/wow/c/bronze-dragonflight-nordrassil
if there’s nothing there of interest, check out the recruitment forums here:
And just because I can … this is our realm recruitment post