Holy Basil is great for cutting cortisol and blood sugar, but yeah, it can make you tired, but so can
herbs that target GABA such as passionflower
or kava
or valerian -- they're relaxants, so they relax you. Aswaghanda is an adaptogen, as is Holy Basil, and it does usually have a relaxing effect. What you're looking for is an energizing adaptogen that doesn't make you nervous, it sounds like.