If I understand your post correctly here, you are looking for volunteer coders to collaborate with you on your O/S development project. Is that right? if so, then the right place for that would be in your feeds.
The forum is meant for asking questions related to programming, collaborative problem solving, the courses materials, or anything SoloLearn related.
As stated in the welcome page, off topics, general discussions, open ended contents should be written as feeds post.
Good luck with the project! 👍
I would suggest that you don't waste your time making an OS. It is way more complicated than you probably imagine. Nothing can compete with the three main OS's these days. I thought of it, but it will take tons of work and won't be anywhere near the quality of the top 3 OS.