Maybe meditating will be relatively easy for you. That means you would be able to naturally get into a state of very pleasant joyful relaxation. Once you learn to focus on the breath you start to notice some spontaneous feelings of wholesome pleasure which you can then expand to become immersive. It's called jhana/dhyana practice in Buddhism and you can get more detailed instructions in books like these:

https://www.amazon.com/Focused-Fearless-Meditators-States-Cl...

https://www.amazon.com/Right-Concentration-Practical-Guide-J...

https://www.amazon.com/Mindfulness-Bliss-Beyond-Meditators-H...

"The Mind Illuminated" ( https://www.amazon.com/Mind-Illuminated-Complete-Meditation-... ) is very good, and contains all you need for your practice.

The author is both a long term meditator and used to be a neuroscience professor. The book teaches meditation in a stage by stage way which is very easy to follow.

Another excellent book is "Mindfulness, Bliss, and Beyond: A Meditator's Handbook" (https://www.amazon.com/Mindfulness-Bliss-Beyond-Meditators-H...).