In principle, it is ok to change direction, as long as the current tutor agrees, there will be a tutor who is willing to accept you after changing direction. Generally speaking, however, it is not recommended to change direction. Comparing changing directions often means that a lot of work done before becomes meaningless. If you change directions for no reason, it is easy to give the tutor a feeling of distrust. Therefore, if there is no special reason, try to consider carefully when choosing a direction at first, and avoid changing directions or changing tutors.