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There are not really courses at TAC. Instead there is the daily challenge. Each week there is a new challenge that teaches you one or more skills/techniques. Each week is a new “course”.
Each daily challenge will expose you to new techniques and the idea is to try to play the daily challenge as best you can for 10 mins and then move on. Each challenge repeats every year, so the idea is when it comes around again you will progress a little further.
Given how long you have been playing some of the challenges will not be a challenge at all, but there probably be some challenges that introduce techniques that are new to you. Perhaps it will be palm muting, percussive strumming, accented chords, etc. Hopefully there are things you have not been exposed to before.