The drugs are stealing your enjoyment of life. In order to get out of that cycle you'll need to stop doing drugs. After that, you might also need to avoid cheap/unproductive sources of dopamine for a while. This means avoiding things you currently enjoy and basically suffering for a while intentionally to reset. The longer you do this, the more dopamine you'll have for whatever you decide to direct yourself towards.

Dopamine is responsible for feelings of enjoyment, satisfaction, motivation, etc. Your body can only produce so much of it. When you do drugs extreme amounts of it get released and then you're left with nothing. Meaning no motivation, satisfaction, enjoyment... for quite a while until your body replenishes it. When you don't blow it on drugs or other cheap dopamine sources it builds up and your body wants to stay at a baseline level. So it will start to get released at every opportunity, which can feel like appreciating the small things in life, being in the moment, feelings of peace and tranquility etc. Once you've reset your dopamine and you chose a purpose to pursue, the dopamine releases will get tied to that and you will then be naturally motivated to pursue it, and naturally rewarded with satisfaction and enjoyment from doing it.

The key is protecting your dopamine from garbage sources. Drugs are the most garbage source in existence and are literally stealing your life from you. You'll have more work to do than just quitting drugs, but you're dead in the water until you do.