Usually, it is not possible to work with more than one therapist, and almost all therapists who work via the Harley Therapy Platform will decline to work with a client who is already working with another therapist.
Therapy is a process that requires commitment and continuity, as well as time to reflect between sessions. It is also a relationship that requires trust. Working with more than one therapist can be confusing and it can be difficult to keep track of what you have discussed with whom, and can potentially mean you avoid a proper connection of trust, ultimately slowing down the progress you are looking to make.