There is nothing wrong with ambitious goals. I do suggest to lower expectations a little I.e. increase your time horizon to see the results. You can feel your progress as you see and recognize words/phrases in the wild and start reading beginner manga by joining a book club.
For mastery/fluency (whatever your definition might be), it will be a marathon and not a sprint.
Here are some of the climb threads for you to consider. You can join any single one of them or all of them. (I recommend joining one and giving it a few months before deciding if you want to switch)
All of the threads have their own quirks. You can’t go wrong with picking any thread. If you still can’t decide, just assign a number to each thread and roll a dice (physical or virtual) and go with it
If you want to keep track of your progress on a separate thread, you can type “Study Log” into the search bar and look up multiple study logs to pick a format that suits you and create your own study log
Probably to do:
Join a journey thread.
Join a book club.
Start your own study log.
You can take one step at a time and move at a pace that works for you.