What is curious about your email is that it isn’t presented so much as a question as it is a statement. You’re saying you are dissatisfied — particularly in the last sentence — where you say that you are empty. You describe yourself as being motivated, not attached to outcomes, and detached. These are not universally negative things, but I’m assuming there is a question about how to change these experiences because of the emptiness.
The work is to find moments when you are feeling something other than what you describe. A moment of engagement, or receiving someone’s kindness, a loving act toward you, receiving pleasure, accepting a gift, even tasting good food. The idea is to find those moments that are different from what you normally interpret as “empty”. The work is in finding some fragments that are not simply when you are existing. Look for natural times when something different — something better — has happened. Noticing the differences and savoring them will allow them to be highlighted.
It is easier to amplify something that is present than to create a reaction from scratch. The more you are able to notice and amplify the differences the more engagement and connection to your life you will feel.