There are so many elements of music to think about when improvising! It's so easy for our brains to get into the "red zone" and overload! There's not only WHICH notes to play, but HOW to play them: volume, articulation, intonation, breathing, rests, phrasing...
In the beginning, to create more "space" or "processing speed" in the brain, limit your improvisation to the first three notes of the scale. Record yourself and share your examples here or post them in the 🌊Improv Waterfall!