the time of the employee in the company is limited as he could be sacked at any time.

Yes and there is very little one can do about it. The model of business is for profit and if an employee stands in the way of that, they are gone.

I also face this challenge, not having a idea of what is valuable. I still have to think of what am I good at, what do I know that is worth sharing.

And then developing and building the network that complements it. It might not be a "profitable" journey, but it is rewarding.