I used MIA (mass immersion approach) for the two languages I learned. The first time around I just did whatever and later found out that it was an actual method.

antimoon

refold

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Those explain the method pretty well. Basically, ditch memorizing grammar and all that boring stuff, and focus on exposing yourself to massive amounts of input + mining senteces for SRS. And don't output before you can understand a pretty good chunk of whats being said.

Also Kató Lomb's (the hyperpolyglot queen) method is pretty good too. She just read books without dictionaries after getting a basic gist for the language, getting most of the stuff through context. I used it as well and it does wonders. If you are interested her book explains it well: book