Ideas and/or treatments for increasing blood flow to the brain

[DH43]

I had a SPECT scan done and the results reviewed noticeably minimal blood flow to the cerebellum (as it pertains to mental activity, not physical activity).  The on-site clinician stated my scan was most akin to a former professional football player who had one or more concussions.  I am not that man but I do apparently have a blood flow problem to the cerebellum.  The cerebrum oddly has increased blood flow to certain areas when it shouldn't, including a seemingly over-excited thalamus.  Suggestions on all of these are appreciated but I am primarily interested in how I could increase blood flow the the cerebellum.  That area seems most critical.