I feel you. I had few experiences of prolonged hyperfocus in my life, and I'm still amazed about how much I could accomplish in short time, how full of energy I was, and how happy I was then. Alas, I can't reproduce this state.
I've mentioned this on HN before and got some good ideas in replies[0], but I still can't find a formula that can bring that state back. Unfortunately, I concluded that the most plausible answer is somewhat dysfunctional and... "base", for a lack of better term - those hyperfocus achievements had a big component of impressing my peer group. They started with me telling myself or someone else, "like hell I/we can't do X, hold my beer...". Something I can't really recreate these days.
I've mentioned this on HN before and got some good ideas in replies[0], but I still can't find a formula that can bring that state back. Unfortunately, I concluded that the most plausible answer is somewhat dysfunctional and... "base", for a lack of better term - those hyperfocus achievements had a big component of impressing my peer group. They started with me telling myself or someone else, "like hell I/we can't do X, hold my beer...". Something I can't really recreate these days.
--
[0] - https://news.ycombinator.com/item?id=24318052