Yeah that is true, new chambers dont have same chances to be download as popular maps.
But i think that was problem of steam workshop not from aperture tag devolpers... If some developer can change this to upgrade new map chances to be downloaded do it pls ty

I agree with this. On the Portal 2 workshops I've played obviously half done and extremely basic chambers below amature level because sooo many others have played it. Then I make chambers, put loads of hours making it comming up with things people haven't seen before and even testing it on friends before uploading it to the public to get rid of unintended solutions. My chamber though doesn't reach through the static of all other chambers at all.

Question is how did those other chambers become so popular? What did the creators do? Or were they just lucky?

I think there are some admins or mods who random choose recent chamber without testing it and move to popular, there is no reasson how this test is on popular tests today https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=292945210&searchtext=

I prefer play some recent tests like this
https://steamhost.cn/steamcommunity_com/sharedfiles/filedetails/?id=291756161&searchtext=
because are better than populars and dont have enought ¿subs?

So sad this workshop configuration

Some times this make you think, is worth waste you time on workshop? After this i dont know...

... Want to build a new chamber, though.

For me it's actually never a waste. I love the process of building a chamber so much I'd build them anyway even if no one else plays it. Usually I have friends willing to test it to find unintended solutions anyway. It'll be awesome if more people actually though.

If you want more popular maps I would recommend releasing them on friday night or early saturday morning, that way it might give you a better chance because part of the people who play might have work during the week and not much time to play.