I don’t have a main source of grammar. I see what to study next myself by checking Bunpro’s order and I navigate the internet/textbooks I have with me for explanations until I feel like I have it pretty solid. But my approach is different, since I’m writing my own textbook.
The biggest take I get is that you should focus on seeing which tools work better for you. No source is complete. They’re all missing relevant stuff, no matter if it’s the most sold Japanese textbook or the most expensive one (like the Dictionary of Japanese Grammar). That’s why it’s better to focus on something that actually puts you to study on a regular basis and that doesn’t seem like a chore.
Another thing is actually practicing what you learn, and that implies using the grammar. Making some example sentences after learning a grammar point won’t take you much time and it will help you figure out how well you actually know it (and if you don’t, then you’ll be able to identify what questions you have).