You will need to continue to work with doing it.
You need get everything back to the places where it needs to be then it will transition to more maintenance type work.
It doesn’t hold at first because you are making a change in the positioning/tightness of the muscle/tissue.
This can take some time.
As Kelly has noted no days off with mobility. Working with something from today and something for tomorrow.
Did the therapist give you recommendations on what to do to improve the situation?
Some to start with
Pro Episode # 21 – Pro-User Request Friday: Not Seeing The Change? You Need a Systems Approach.
Jill Miller Smashes Your Guts! (and psoas, and tacked down viscera, and matted down abdominals…) Part 2
Episode 301: Psoas Flossing and Biker Hips
Episode 129: The Twin Bowstrings, the Psoas and Scalenes
Episode 75: Your Inside Psoas Bits, World Record?
Episode 40: USAW Oly Prep: Some New Hip Love /Psoas/Calves
Episode 26: Hips and Seppuku: Psoas and Hip Soft Tissue Mob
Episode 11: How to “Stretch” Your Back Bits
Episode 04: Silent P in Filet, Very Paleo