Oh man, yeah. This isn't talked about much, because most guys don't get to this point, but once you can pretty much be cool in most social circles or can adapt quickly if given enough chances....you get bored.
It's nice, though. It's calm. You feel "old."
It's the same as when you become great in any field. A great actor, rapper, athlete, etc. What it takes to get to a high level in anything requires some talent, dedication, and insane willpower. Most don't do it. It's simple in practice, but most don't do it.
Problem is, you have now molded yourself into a Great Man and then you look around and see underachievers. Everyone has their own path and maybe their virtue is greater than yours, they are just less ambitious, but you can't help but feel some disdain/disgust/boredom/annoyance with most people.
All friendships are transaction at their core. It's not bad, just is. Unfortunately, when you're high value, there becomes a small pool of people who can give you as much as you give. It's a LOT of people, in actuality, but FINDING them is hard.
And what's more is that even if you do find really successful people, they might be horrible people, too.
What I do now, and it seems to be working, is
1. I value good behavior above all; if I see their behavior is shit with others, I assume I'm no exception and keep them not as close. I'm always analyzing those around me, wary of the slightest misstep. It's not paranoia since I only turn it on when they're around or I need to review one of their actions. It keeps me always aware of the energies I bring around me. Once a serious move of disrespect or breach of trust happens, they are given a quick trial and then put on probation (kinda...it's a bit more nuanced, but I always keep the virtue of my friends in check).
2. I value women's opinions of men. The reason is because the guys who I know are not attractive to women tend to be sleazy needy guys 99% of the time. They'll betray you for pussy or status, cuz they get so little of it. He doesn't need to be GOOD with girls, cuz that's a skill, but if he's not pretty attractive to women? Don't know what it is but they always turn up to be bad apples.
Anyone else, cut them out. This is all of course assuming they're valuable to you in other ways (they're funny, you vibe, they are gracious, etc). This is just the "friend quality" screening.
Now...to FIND them, well, you might need to move to a bigger city. Start hanging out in high level social circles (money helps you get here) and combing through the seas of sociopaths for genuine high valuable people. If you have amazing social skills, you can do it for cheap (joining nightlife scene, for instance). Or join business-related clubs (like Rotary).
See how high you can go and then train at that level for a bit. You weren't valuable enough for the higher levels...yet. Grind fundamentals and get closer to the Alphas of the group.
Then onto the next level.
I like to set goals for myself, too. If 10 is a social circle connected to aristocracy/political/celebrity/billionaire-business, a 9 is local celebrity connections (within your country only), 8 is nightlife scene royalty, etc etc., and 1 is incel, where would you rank yourself? And what's your goal?
You're going to burn through LOTS of friends in time. And some will just fade away. I'm only 27 but have cycled through more social circles than I can fucking fathom. I'm a tough personality, to be fair, but I also continue to "level up."
So, yeah, screen for quality and then set goals for yourself, and then put yourself in those environments.
Hector