Green tea has l-theanine in it which calms the mind allegedly. Might work for you! Matcha and guayusa as well. Alternatively you can get l-theanine as a supplem

Green tea has l-theanine in it which calms the mind allegedly. Might work for you! Matcha and guayusa as well. Alternatively you can get l-theanine as a supplement if you want to keep your coffee habit