I've been using castor oil on my hair for over a month, still not seeing results. What do you suggest? (Photo)

You definitely need to do some basic research into male pattern baldness. Castor oil isn't recommended as a first line of defense for hair loss. A proper medical examination by a hair restoration physician and diagnosis could help your situation. Finasteride, also known as Propecia can halt hair loss in it's tracks. Please read the link below concerning the medical treatments available today for hair loss.

There is no good evidence that castor oil helps hair loss to any significant degree. I would advise meeting with a physician knowledgeable about hair loss to reciew treatments that are backed up by good clinical trials.

You have a number of effective options available to you - but none of them are castor oil.  Finasteride, minoxidil, various shampoos, LLLT/PBMT (low level light), and possibly PRP are all options for you with excellent safety profiles and track records.  You also have some well-respected hair doctors in Colorado, especially in the Denver area, so seek out some excellent advice with a personal consultation now because you will thank yourself later for saving as much hair as you can now.
Good Luck!