Fly to foreign country.
Waive passport around.
Find hot foreign chick.
Profit.
Lol this won't work for everyone. I worked a few years abroad in one of the Eastern European countries. The women on average were hot af, just walking around the city in the summer would make your head spin. I worked in a multinational company and knew of some dudes who came there for this exact reason, and they couldn't get any tail at all, you could see and smell their desperation from 50m away. Absolutely no game at all. It wasn't about money, or looks, or dressing well, they just didn't know how to talk and make connections, and not just to the opposite sex.
I also want to stress that being a fuckboy isn't all the hype. I got into the best shape of my life during that period, and I purposely ditched my friends so I could go to the pool alone in the summer. I must've dropped like 10 20-25s over one summer just from this (I was mid 30s at the time). But what happened afterwards caught me offguard, my friends took notice and I started to feel their attitude towards me change. This was both men and women. It wasn't jealousy or envy or anything (especially from men, they were in happy relationships), more like pity. I was the one they were coming to for advice, help etc, because I was generally seen as reliable and trustworthy. Once I started roleplaying as Casanova this really negatively impacted all my friendships, with both men and women. I didn't really get it at the time, I was getting my dick wet with a different woman every few days, thinking I was on top of the world, but what I eventually realized is that most people tend to gravitate to stable people, and my actions were anything but. What really hurt me was that I did consider these people to be real friends, and had some level of respect for them, and seeing first hand how their opinion of me changed really made me take note and eventually change my ways.
Fast forward a few years, I got out of shape because I had to stop working out due to injuries. Moved countries, kept the friends, made new ones. Made a career switch that was probably the single best thing I ever did in my life for personal growth. For the first year I had no idea what comfort zone even looked like anymore. Just insane amounts of responsibility and stress. But I overcame it, and my confidence is now through the roof, and this is reflected in personal life as well. Talking to anyone comes naturally, be it a business partner, colleagues at work, random interactions on the train, at the store, you name it. I became friends with many of the women I work with. We talk shit all the time, go out often. What starts as a quick business call often turns into an hour long chat about random things because it's enjoyable. It feels natural, no one is forcing it. Women at work are actively trying to hook me up with their friends. Whenever we go for business conferences I'm their first choice for the designated driver because they know the trip will be fun. I'll roll up to the event with 4 laughing women coming out of the car and I've had people ask me - how do you do it? When I hit bad times, such as when I got badly sick or when my dog died, they were calling me every day to check up on me. Couple of them almost bought me a new puppy because they were afraid I wouldn't recover from grief. And it feels good to know that there are people in your life outside of your family that really care, because developing these kind of relationships is really hard.
In any case, I am once again seen as "the man". The one they reach out to when shit needs to get done or when advice is needed. And I like that, I really do. It opens up so many doors, both professionally and in personal life. And I see it in other people too, those who excel at their job and know how to socially navigate at least a little bit, people want to be near them. Regardless of looks, age, nationality, whatever.
tldr: My advice to anyone struggling is to build confidence. Work is an obvious vector for this because we spend so much time in our lives working. I don't even know if it translates to other things like hobbies, but if you think it has merit, by all means, go for it. And
listen to other people. Conversations are a two way street, don't just wait for the cue to talk about yourself. Build trust. Actions mean more than your words. What happens after will be a result of how you conduct yourself, and opportunities might present themselves that you were oblivious to at first.