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As a layperson, the research I've seen (which focuses on treatment of psychotic disorders) suggests that the only activity known to reliably reduce dopamine activity is taking antipsychotic drugs, a caveat being that there's a decent amount of disagreement as to how big a role dopamine specifically plays in psychotic symptoms (and hence how much we can assume that observed symptom reduction correlates to dopamine antagonism). A major issue with these drugs is that they tend to downregulate dopamine activity very broadly, often screwing up the central nervous system, metabolism, and possibly even immune function. Dopamine seems to be a versatile molecule that gets involved in a lot of processes.