Making progress on meaningful projects is the key to enjoying your work (and staying ahead of burnout).
But it’s not so much about celebrating the big milestones as it is about appreciating every small, daily step forward.
(My personal fave is her ‘analogue progress tracker’ idea — I came across it a couple of years ago and have been using it ever since. It's given me a noticeable boost not only in feelings of progress, but also groundedness and motivation.)