Is there, in the opinion of the members of the “Philosophy” community, a certain fundamental law of human existence that would serve as the main motivation for human activity — both in everyday life and in practically all spheres of social life?I believe that such a law exists. I am ready to present both the formula of such a law and my arguments, and to discuss this topic if it interests the members of the community. I would be grateful for future comments.

This feels more like you arrived at a conclusion and want people to debate you than an actual conversation starter.
Not exactly encouraging, from my perspective. Most people who start with such specific wording and a vague stance that they announce they’re prepared to detail and debate don’t actually want to converse so much as write a dissertation and have a captive audience to read it, more so than engage in a true, two-way debate.
To wit: how are you defining the phrase “philosophical law of human existence”? Because it reads like nonsense to me without more context.