Answer

Hello Aviad.
Observance of the commandments has value when it expresses commitment to the authority of the Holy One, blessed be He (= the Commander). That is the meaning of the concept of a commandment. Observing the commandments because they are binding is the only kind of observance that has religious value. Therefore, if a person observes commandments in the spirit of Ahad Ha’am (“More than the Jewish people kept the Sabbath, the Sabbath kept the Jewish people”), that has no religious value. A person must observe commandments out of responsiveness to God’s command and the understanding that His word is binding and valid.
Now you have to ask yourself what constitutes a sufficient basis for you to understand that there is a command, that it comes from the Holy One, blessed be He, and that it is binding. For me, that is only revelation. Others think that spiritual intuitions are also enough for this, perhaps like moral imperatives that are based on an inner feeling (though that seems puzzling to me with regard to commandments).
Commitment to codes that were written and created after the revelation at Mount Sinai can be based only on that event itself. No person or nation is seen by me as having binding authority over me. I can do what the nation or this or that sage wants in order to identify with them, or simply because I like it. But that is not observance of commandments; at most it is one culture or another.
I have explained here several times that this is what Maimonides, in the Laws of Idolatry 3:6, calls “acceptance as divine.”