"When we have something great for a long time, It can be hard to appreciate it. The longer we have something, the more the value goes down." very well said and articulated diving to the core of the problem.

The addiction of comparing oneself to others is another reason why we can't be grateful for what we already have or what we already are. Giving the truth that the more we practice comparison the more we need to compare.

Thanks @Kaylinart for that in-depth approach.