If you are severely plagued by akrasia, and there is some large class of experiences that you completely leave out of your life, attempt to find a way to incorporate something from that class.

I find this suggestion hard to follow. There are far more experiences I don't have than ones I do have, and I think this is true for almost everyone. How would I know where to start? Should I take up dancing? Baking? Painting? Horse riding? Ant farming? Blogging? :-)

If our brains can have a deficiency of some kind of activity, there must be a relatively small number of such activity types. Unless we can figure out what they are we won't make much progress.

Also, unlike pica (where you say at least some sufferers have a craving for iron-rich food, which helps them), we don't know if "positive" akrasia ever drives people to do the thing they lack (because we don't know what it is they lack). Why should we suppose akrasia ever serves to fix a problem except by coincidence?