This is a weird question, but i think may help lots of people. How do you friendzone girls, so they can stay our good friends and will lead to further social connection with other hotter girls?

Initially, i thought friendzoning a girl is jsut be nice, dont flirt, dont escalate and wait long enough they will become your friends. but it seems like thats not the usual case. most of the time it seems like when u do that and wait long enough their window of opportunity to escalate close. they end up losing attraction in you and thinking you are a boring chump. Worse is that they often become awkward with you and that ruins ur social proof furthermore.

any suggestion?

Of course they loose attraction for you. Thats what you want if you want to friendzone them.
But i think i get what you mean... Its still alright to "escalate". I think the key is to always keep them on this thin line between flirting and being just friends. If you deny any form of flirting or touching and communicating of course ANY human being will lose interest.
You can still flirt and touch and chat with people you only want to be friends with. Just dont take it to sexual and you´re good to go i think. At least thats what works for me.
In fact little sexual comments and touches can spice up a boring "just being friends" relationship. I see this at work every day. I just switched my working place (still the same building just different department) and i now work with many girls. They´re all great looking. They all have a boyfriend or are married. So what? I still flirt with them touch them in a friendly way and guess what? They love it! They love me! Just as a friend of course. And thats perfectly fine because THEY can open new doors to other hot girls.