Doing too much
After the low in my daily productivity, it's hard to get back on track with a new streak. Just when I thought this system is finally perfect I'm back with the same problem I had at the beginning of this iteration. I'm doing too much too fast.
Starting slowly would make it easier to get a longer streak. It would give some time to stay a bit lower and have some easier days in the beginning. Getting those small increases would also mean there would be more of those "better than yesterday" -days.