Interval ear training exercises are a great way to improv…

https://www.musical-u.com/learn/practice-with-interval-ear-training-exercises/
Interval ear training exercises are a great way to improve your sense of relative pitch and get a better instinctive understanding of music.

And Musical U has a full series of exercises to help you! https://www.musical-u.com/learn/practice-with-interval-ear-training-exercises/