Now, it seems to me that there are two keys to appreciation: active perception and understanding. You are not skilled at either of these things, though you have the capacity for both, particularly the latter. Regarding the former, you must constantly struggle to remain attentive to the here and now - to the thing being appreciated - if you ever hope to live a full life. Regarding understanding, you have been lazy up until now where it comes to understanding things which are difficult or strange to you.
Pay attention to the details of your work and your habits and your pastimes. Learn what other people have said and done, understand the details and context of your actions. If you do these things, you will not only appreciate the work of others, but you will appreciate your own life's work. And that is the best definition of happiness - long-term happiness - that I can think of.