I just launched my premium version of The Scientific Meal Planner and posted it to reddit's r/plantbaseddiet and they seem to love it (https://www.reddit.com/r/PlantBasedDiet/comments/jya2g1/the_scientific_meal_planner_fall_update/)
I'm at 10 subscribers mostly from this. Around 400 sign ups for the free version from just this reddit post. I think I'm feeling like this validates my idea and now I just need to focus hardcore on marketing for awhile. I'm going to spend the next month or two 100% on marketing efforts. I need something like 500 subscribers to actually pay my bills. Will be interesting to see if I can achieve that... and how long it might take. But I think I've drunk my own kool-aid enough to keep trying to reach that for like another year.