There is no way to remove it manually. You just need to keep listening to music you like and over the next week or 2 the recommendations should update to things similar to what you are listening to.
C'mon Paul: Give Andrew a chance. There might be a musical lover hidden inside you which is just waiting to be uncovered 😋
I found the "discover" recommendation section within the Browse module to update quite quickly within a week if I am not clicking on any of those recommendations and use the arrows top right to look at and engage with other pages of that.