how can l fill in the blank?

Spontaneity (not sure if that's the correct spelling)

Spontaneity

“Winging it” or “improvising” would work.

Spontaneity or being spontaneous

Spontaneity perhaps?

spontaneity.

The word that came into my mind was “spontaneity.” That’s not a normal word for a beginner to know. You could say you enjoy improvising, but that’s still quite an advanced word. I enjoy surprises. 🤷‍♂️

If you want to use an idiom instead of one word, you could say "playing things by ear." This can mean learning a musical piece by listening to it instead of reading music, but it's also used to describe not planning ahead and adapting to events as they happen.

spontaneity. impulsiveness. winging it. extemporisation. spur-of-the-moment, unplanned events. improvisation.

Flying by the seat of my pants, if you want to get really idiomatic.

Spontaneity Playing it by ear Going with the flow Winging it / to wing it Flying by the seat of my pants There are really an endless number of ways to full this in, and I don't know what is expected of you. But depending on the vibes you may also see A little chaos the unknown To go in blind

Since others have provided you with suitable words, I'll add an idiom you can use: I enjoy thinking on my feet.

Spontaneity