What do you mean by a cool life? My attention isn’t simply on girls, i focus on developing myself a lot. But still this **** is simply ain’t clicking
Get a new hobby - does not matter how many you have, get something more. Learn more skills. Find new social circles. Do something you find enjoyable and are (or given time will be) proficient in. Let other people (not just girls) see you in that environment. Never go outside just to look for girls - unless it is a date, a proto-date, or you just seek social experience. Go outside because you want to go, and focus on yourself.
I’ve read a book by Roosh on game and some others suggesting “warm approaches” where you approach only after receiving two or more indicators. Are there other strategies besides these 2?
Yes, I tend to agree. Even if it may not be optimal, it surely is the most efficient way to do it. Unless you just need to overcome approach, etc, anxiety - then just do cold (and warm) approaches ad nauseam.
In the end, girls like confidence. They like a man who knows what he is doing. The fact is, that "older" men in their 30s, etc, have had more time to build up real value and thus confidence. While younger men may come off as try-hard, older men usually do not need to, because they know their value - if they have any, of course.
Also, based on some of your comment replies here: Humility (not the nice guy syndrome!) comes a long way, including with women.