The stimulant caffeine is a popular alternative (provided you’re not overly sensitive to it [it can cause heart palpitations and anxiety], and don’t take it too late in the day) — lots of people use it to self-medicate ;)
On the non-medicine side, techniques like bullet journaling are useful, also having “accountability partners” — friends or groups you report in with each week to check on each other’s progress; things like that.