In addition to the other comments about taking care of yourself, and "soft" nootropics like piracetam, I have personally had excellent results with judicious us

In addition to the other comments about taking care of yourself, and "soft" nootropics like piracetam, I have personally had excellent results with judicious use of amphetamines and nicotine. You have to know the risks (cardiovascular, addiction), and treat them with the respect that they deserve (don't overuse, take breaks, etc.), but they can be incredibly useful if used properly (or incredibly dangerous if not).