As a comment about changing an instrumental value to a terminal value, I'm just going to copy and paste from a recent thread, as it seems equally relevant here.

The recent thread about Willpower as a Resource identified the fundamental issue.

There are tasks we ought to do, and tasks we want to do, and the latter don't suffer from will power limitations. Find tasks that server your purpose that you want to do. Then do your best to remind yourself that you want the end, and therefore you want the means. Attitude is everything.