First of all congratulations on your achievement! You had a great ride at WK.
Second of all your post is great, very informative and motivating. I really like how you organized your overall studies.
And finally, I just found out your Study Log, and I wish I did this earlier. It is really amazing that you stick with detailed weekly logging, and went beyond numbers and stats, but also added experiences, tries and impressions. To have all learning journey documented in one place is incredible. Just imagine re-reading the very beginning of the log few years later, should be fun.
All the best!
P.S. I hope you will continue your Study Log. Level 60 is just a number, learning Japanese does not stop at that, maybe even starts at that 
P.P.S. There is a old but very fun The Level 60 compilation topic that was locked due to inactivity, and went into oblivion, but it was unlocked recently - feel free to add yours if interested, it’s a wiki.