I would recommend studying more than five minutes a day. I don’t know your study habits, but if you’re putting five minutes a day, or 30 minutes a week into Bunpro, or just grammar, that’s simply not enough time to understand material.
Ideally spending at least 30 minutes a day for six days a week will yield in a higher outcome of success.
The more time you put into something, the higher of a chance of you understanding what you’re focusing on. I think it’s great you developed a habit, as that really is the hardest part of the journey, but maybe increase the intensity gradually. So next week do ten minutes, fifteen, and just keep adding more time until you find a good balance of comprehension and sanity.