Question is in the thread title.
What I mean by having mastered is that every time you travel there you have somewhat a build-up from scratch social circle waiting for you or girls, you know where to go out at night to have a good time and have a pattern to pull girls, you can impress locals with your your knowledge of the city even if they think it's your first time there, you have pulled at least a few times (even if it took hard work at first) and you got logistics on point.
Specify also the cities that you thought were really hard at first/or considered hard by the community but after some time it started paying off; I guess those answers will be the most interesting.
What I mean by having mastered is that every time you travel there you have somewhat a build-up from scratch social circle waiting for you or girls, you know where to go out at night to have a good time and have a pattern to pull girls, you can impress locals with your your knowledge of the city even if they think it's your first time there, you have pulled at least a few times (even if it took hard work at first) and you got logistics on point.
Specify also the cities that you thought were really hard at first/or considered hard by the community but after some time it started paying off; I guess those answers will be the most interesting.