depends, but no one is giving away accredited courses. You need a formal degree, not just a collection of courses.  You can always do a tech local college diploma but that won’t lead to an arch license. 

Work construction, go travel, flip through quality publications (El Croquis, Detail, Shinkenchiku, A+U) and find architects whose work you really reinstate with and then do a deep dive on them specifically, sketch a lot, design and build some furniture for your place.

These would be a better use of time and money than taking random courses given your BFA background IMO. Most architecture courses are glorified art school courses already.

Check into a few universities you’d be interested in attending for the M.Arch. It used to be that calculus and physics were pre-reqs for an M.Arch. It wouldn’t be bad to also have a geometry class under your belt if you don’t already. Arch degrees aren’t typically math heavy, but structures courses can be intimidating if you’re not familiar with some of the math concepts.

IF you're interested in programs located in the US, take a look at the  ACSA where to study guide and look at the MArch I programs. From there you can reach out to programs that might seem interesting to you and ask what their minimum requirements are.