@claudiu that’s interesting because I have been approaching this from a different angle altogether, it seems so at least.
To summarise, the target of appreciation has been the world of people, things and events, not feeling good specifically.
The focus on appreciation started when Vineeto urged us to turn any sadness surrounding Richard’s death into appreciation for his life and his words. Then further to allow this appreciation to ‘spill over’ into appreciating this wonderful universe which exists all around, including the natural world and one’s fellow human beings.
And doing so is what increases both the scope and the depth of enjoyment, it’s essentially assessing the true worth of what this universe is like and what it means to be alive.