I’d suggest Genki 1, which is what I used when I first started. It’s easily digestible an offers a gradual pacing which is great for starting out. It also offers a ton of writing practice, which you should do! Writing out my answers and then reading them out loud helps me remember how to actually use that grammar point I just learned. Genki also has a companion workbook you can get on amazon for cheap ^___^ The nice thing about Genki is that it continues with a second volume, which helps you bridge over to Intermediate level really comfortably. I also agree with @syphus-- I think you need structure to succeed, just like I do Building that for yourself is hard, though, I know.
Tae Kim is also a good resource, but I’d break that down into 2-5 grammar points a day (I like to learn in “chapters”—don’t overload). I’d also suggest writing practice sentences from each point in a lil’ journal and also speaking them out loud to yourself. Then it’s like an act of grammar, it’s in motion, you know? It feels more real that way (like Koichi says when you are learning a mnemonic—it has to be you, really there it, for it to work best).
It’s like when you work out, even; if you overload, you’re gonna have a bad time. You want a certain type of exercise on a given day (arm day, leg day) and lots of reps on the same area to tone it, versus doing a full body workout all at once that makes you ultra sore!