You have a digital SLR. I see no benefit in getting a film SLR. Film work flow is just getting less and less convenient. Yes, the modern DSLRs mostly have inconvenient crop factors and are large and heavy, but I would still have trouble reaching for a film SLR for a job if there was a DSLR right next to it.
Your M6 biogon camera kit is a top of the line tool for a specific way of working. You have to decide what way and subject matter you would like to work with. I use my digital when I work, so I can be sure I got a shot. I use my rangefinder for fun and art photography. There's no perfect camera, just what you like.
I'm happy that you had the chance to try a leica early in your career. The Leicas (and the many other great rfs such as Zeiss and Cosina) are simple cameras that allow me to have the bare minimum of things to think about---but they do force me to think as well. You will only see the advantage of them once you learn to use them intuitively: zone focusing, previsualizing the frame, anticipating the peak of the moment, etc... They become "point and shoot" cameras. The way that RFs made me think before taking a picture is not easy to adapt to, but it has been rewarding.
I love my Leica because of the special way the lenses interpret the world. I love working with the machine: fiddling with knobs, rings, and buttons. I'm delighted when I get back a lovely photo that I wouldn't have achieved with a DSLR.