ok man, lets use value as a metric for what the girl sees in you as potential for gain on her part, you will have a certain social market value based on alot of factors
the ''no sex'' zone, rather then the friend zone (because you can have sex with your friends and not date), is usually one of two things
you either have the value but were short on intent and unable to move things forward, in this case, usually the girl will lose interest (she is still attracted, just not interested), when she starts to lose interest, she falls off, becomes less responsive, more likely to flake, but usually still the same in person, when this happens if you keep hanging out and contacting the girl, eventually things will become stagnant and a frame around it being normal for you both to just not flirt or have sex becomes solidified and it just sort of feels weird to sleep together, in this situation you can use numerous tactics to try to flip this, but sometimes it is long gone and the frame is too solid in the girls mind, the impression is made and you are just friends and her vagina can not have girl boners for you...
here are some tactics to re-frame the situation out of the friend zone when you have the value
-start making the girl think of you in a more romantic context, start hitting on other girls around her, show interest in her friends and other girls, talk about sex with her, what you like and dis-like, slow make it comfortable, start slowly introducing more touching and build it up, eventually just keep increasing what is acceptable until you are fooling around (this will only work if she has the compliance built to hang out with you 1 on 1 with no problems)
-drop contact for 2 weeks, do your best to keep yourself as busy as possible, keep your mind away from the girl and clear your thoughts about her, when you come back, just start off with small comments like, you know something is different about you, then start flirting bit by bit, and start escalating, do it like you would do any normal girl from a bar you wanted to pick up and sleep with in one night, just escalate up some compliance, hit on her flirt and talk
^the problem with these two, is that if this was the ''fix'' for your problem, you are probably either needy or insecure and can't escalate due to your fear of not being accepted, so you strive to fill the void and find acceptance from others, in the hopes they validate you and escalate on you, rather then just realize you are good enough and validate them and escalate on them, or you just have an issue with anxiety or have some sort of social disorder or mental problem, maybe just really low social intelligence or some sort of phobia being created by some sort of limting belief, for these situations you have to find your own solutions, I suggest research and professional help
but what about the guys that don't have enough of that precieved ''value'' ?, they stroll the streets all day, shitty number after shitty number, alot of girls say no, and alot of girls say yes, then flake or don't respond, they also don't respond well to physical escalation, why is this?, projecting low value, your image needs improvement, but rather then worry about this, it would be more productive for you to learn to control yourself and maintain a high level of discipline, you must learn to shape your habits, keep getting those shitty numbers, value is subjective, eventually you will find a girl that will find you irreplacibly valuable
but you must cut this neediness out of your soul to meet that girl, you are good enough and you don't need to cling to a specific girl, go out and meet others, start working on yourself until your overall ''value'' as a person has improved leaps and bounds, be a better talker, be a better listener, excell at the sports you like, excell at the hobbies you like, set some goals for things you want to do, accomplish them, be better looking, hit that gym on the regular, get a nice tan, shop once in a while for new clothes that you like that suit you, get haircuts, shower all the time, cut your nails (finger and toe), brush/floss your teeth, clean/moisturize your face on the daily, keep your shit all groomed up and manscape your shit, find some friends and talk to them, find girls on the regular and talk to them, even if you have a girlfriend keep talking to people, if you hate socializing find what you love and get good at it, but make sure it is what you love