I completely agree with everything @Speechwithjwo said above. The /s/ can be tricky. It is important for a speech-language pathologist to take a good case history and look at what is happening to help you determine if it is an articulation/phonological disorder or a true tongue thrust. You want to look for a therapist who has experience in Orofacial Myofunctional therapy. This is therapy that looks at the mouth at rest posture to make sure the structure is developing correctly. They will also have experience in TOT.
By looking at the structure the therapist will look at if there are any airway issues, but also look at how the child’s muscles are supporting the child’s tone, and if the tongue is elevating while swallowing instead of thrusting forward.
You should contact some therapists in your area to see if they are doing only virtual or any in person sessions. If they are doing virtual ask them about their experience with treating an /s/ virtually and what a session would look like.
The most important thing to do is practice, practice, practice to make the sound and movement automatic!