noun
sense of fulfillment; sense of accomplishment; feeling of contentment
A positive feeling of satisfaction and completeness, often after achieving something meaningful or spending time well.
仕事を終えて、大きな充実感を感じた。
After finishing the work, I felt a great sense of accomplishment.
趣味に没頭して
When I'm absorbed in my hobby, I get a sense of fulfillment.