I understand the no alcohol stance, but I'm not on board with the no caffeine approach. Moderation is key, and if your body becomes too accustomed to high caffeine intake, taking a few weeks off can help reset your baseline.

Besides that, I didn’t notice any benefits from not consuming caffeine. Do you? 

 And obviously don’t consume it right after waking up (90+ mins is beneficial) or too late in the afternoon.