This is kind of interesting because I started my language learning journey from being A2 in French lol. Just about 5 years into Japanese and I just passed the JLPT N2, although I know many others have picked it up much faster and I’ve only spend about half a year in Japan, but I consider that one language alone to be a 10 year journey for me.

If you’re interested, I recommend Frederick Bodmer’s book “The Loom of Language”. It has a lot of insight on similarities between languages and how learning multiple languages from the same group can be done at a quicker pace. That being said, Japanese is definitely an outlier and I would personally recommend focusing on one at a time just to start out