"Comprehensive language learning plan" could be "Integrated language study strategy" or "Well-rounded language education roadmap". "Achieve your goals" might be "Attain your language milestones" or "Reach your proficiency targets".
So the first sentence becomes:
Moving on, "improve your skills in reading, writing, and speaking Japanese." "Improve" options: refine. "Reading, writing, and speaking" could be comprehending, etc. manabou nihongo pdf
Nihongo study programs: Consider taking a Japanese language course at a local college or language school to get customized guidance and feedback. "improve your skills in reading