I (M 26) learned that you should be kind but direct with women. It worked for me a couple of times and if it didnt work out i just let it be a soon i feel that she doesnt feel the same way.
What i do usualy with a girl i instantly like: I am not letting my self being friendzoned. Like if i meet her, i let her know that i like her pretty early. Nothing pushy but flirty. But as soon as i see that she doesnt feel that way, i stop and i avoid getting into a friendship. Its like a selfdefence, because i know i will get feelings if i continue.
My experience, as long you take the rejection maturely, it works really good. Being direct with your feelings is something women like.
Dont be sexual or start calling her and texting long love letters. You have to give small compliments and as soon nothings comes back STOP! Show genuine interest.
And sometimes shoot your shot and dont be afraid of rejection. Accept it without arguing.
Like it worked for me already 3 times in the past months, i was out partying, met a girl started to talk with her. Didnt push, just talked and showed interest in her. Then i just bluntly asked "Wanna make out?". And it worked, they even complimented being direct and that they didnt expect this. 1 time i got rejected, but i just let it be. I said something like: no worries, i just find you very beautiful and would have hated me for not taking a shot. We laughed and the tension eased.
Funny thing is that a couple of months later we hooked up, after we randomly met.
Maybe this helps someone.