My son and daughter have both had various therapies.
My daughter was similar to me, in one way, that she did not talk for herself, only echoed what others said. Very cute, but when SHE needed to commmunicate, she could not make words. She has been in speech therapy for over three years, now and she is able to talk normally, except for the number of exchanges that kids her age (six) should be able to manage (we are all three, easily distracted). We will continue her speech therapy for the near future. Her occupational therapy only went for one year. She is much more coordinated and dextrous than her older brother, especially her handwriting.
My son has been in occupational therapy for about five years. His speech therapy was discontinued after two years and now his speech and vocabulary are remarkable at age eight.
They are both testing well into the genius/gifted range, but I can not imagine how we could have gotten here without the needed guidance from the proper therapists. They are both in social work groups at public school. We may not continue those for our daughter, because she can be so extroverted at times and basically pwns the social therapy class. They will need a different approach to help her from what they are using, since she already has many skills, though her skills are not always used appropriately. We will continue social group work for my son, at this point.
BTW, my kids are drug-free.