We'd strongly advise anyone seeking a deliberate, significant change in their cognitive function to seek out a licensed professional therapist to develop a targeted treatment selecting the appropriate modalit(ies) that will address the underlying issue (which is rarely as "simple" as it may appear): there is no "one size fits all" approach. Everyone's brain chemistry is unique, and therefore presents unique challenges: and creating a customized treatment plan with the help of a professional is essential. For one person, perhaps a therapist with somatic training is appropriate; for another, perhaps family systems therapist; for another, maybe it's just combining classic CBT with the psychedelic experience.