I am not sure if you put both "type" and "therapy" in plural, why should you pluralize both?
All my friends have had some types of therapy in the last few years, most of them had at least 3.
"some types of therapy" is correct in this context where each person has had multiple types. Your sentence is a comma splice error. Your question is also a comma splice error.
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"some types of therapy" is correct in this context where each person has had multiple types.
Your sentence is a comma splice error. Your question is also a comma splice error.
The tenses "have had ... had" are inconsistent.
It is good style to write small numbers in words: "three". In your sentence, changing "3" to "three" is a particularly big improvement since the word has