Hm, a simple way would be forcing a player to team up, and ofc raid.
Story time:
When i was playing lineage i was i think part of that first new(there was an old one too ofc) anti social generation of players where you would want to solo everything and just mindlessly farm.. sad days. But at a certain point i couldnt do it anymore, i couldnt solo i needed raids and normal mobs wouldnt give me too much of reward. And then me joining a clan was a big step cause new things were unfolding, i had to greet ppl, ppl had to interact with me i made friends we would party and keep tabs on raids at that point of the server every clan had a hall, so the ones we could get would be the conquerable ones, and we had to fight in a 20 v 20 v 40 v 50 at times battles, you had a penalty if you died ofc, no one wanted to lose heard earned xp, so you had to keep staying alive even tho if that meant running away and having to deal with the shame; the thing was you had to play smart and dont die fast, you had to keep tabs on things.
Anyhoo.. im not seeing this anymore.. im seeing servers with "revolutionary ideas" like new classes bull shit events and what not, these ppl i dont even think they played this game before.. ever, and ofc it all sums up to donations for a cheaply hosted server, atm you can get a 20$ vps and run a decent interlude server with acis or some shit. Ohh please help the server with 100eu donation while my mother pays for my bullshit server, damn millennials.
What i'd like to see, dont give out handouts dont make it too easy but not too stupidly hard, no one is gonna play old retail like, well only hard cores but only for a while dont build a server just for 10 ppl. Force them to interact, reward them for it, reward clans, build communitys. Another thing i hate is GMs that are too friendly or GMs that know of an issue and dont do anything about it or avoid ppl just so they dont have to deal with the issue OR DON'T ADMIT THEY ARE IN THE WRONG, or they cant fix it.
Sorry for the end rant there.
PS: Aw i played on a low rate a few months back, i was surprised how huge but empty some clans can be, they recruit.. and nothing after. Soulless.