I know you’re taking about “the magic” with MDMA but I never heard of it being 3 months. I find it an amusing coincidence however that during the period that I most frequently tripped (once every two or 3 weeks for a couple years), my “goal” was to have more self control and trip less, aiming for once per season, or every 3 months. I never really achieved it, until I abruptly went to tripping once or twice, or even none! per year.
DMT is one I should consider. I wrote in another post that I came close to dosing some miprocin but decided against it, partly due to my family due back home. DMT might be perfect for the chunk of time I have available