It’s not a routine, not meetings. Not even social networks or messengers.
#1 thing that kills your productivity is permanent long-term focus on one single project.
Imagine what’s going to happen if you’ll be eating same food every day during a year? Or to put a song on repeat and listening it for a few months? I bet you won’t want to have those things around for a very long time. Same thing happens when you are focused exclusively on single project: your mind’s just getting tired. This is human nature.
To keep yourself up—periodically switch. Find some new stuff to keep your mind busy with and start doing this. Few hours a day, on the weekends or 1 week in the month—adjust intervals and do yourself a favour—switch.