Grammar point each day?

At its heart, I think this becomes a question of quality versus quantity. The faster you learn, the wider your breadth of knowledge, but it will be more shallow. The slower you go, taking the time to really get to know the material, you’ll have depth, but it will be a narrow field of view.

Some methods works for some people, and not for others. Thus, the most important is that you try out a system (such as one grammar point per day), develop a way of measuring whether it’s working for you, and be prepared to change your system if what you’re doing isn’t working.

My personal recommendation is to turn on subtitles and watch one of Cure Dolly’s Japanese from Scratch videos per day (as well as any textbook or Tae Kaim reading you may be doing), then after a month or two of that, look into joining in on whatever comes up next in the Absolute Beginner Book Club.