I recommend Better help as the leading therapy site.
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If you do click on “Teen (for my child)” then It will give you an option to bring you to the second best choice Teen counseling
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The one I used was 7 Cups Which is a site where you get to relate to a community and grow together, they have chat rooms and 1 on 1’s to help you get started.
They also have quizes every day to track your mood (Not very reliable but it calculates my growth.)
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You can also use Psychology Today and call Therapists and Psychologists near you.
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Although, It may not be free it is a good choice.