If you want a rush, try gyukuro. Flavor of an umami green tea with the caffeine level of a cup of coffee & high L-thiamine to cut the jitters.
I lived it the UK briefly & my roommate never understood my fascination generally preferring his Yorkshire tea (trash). One day he asked about it so I made him a mug (we used coffee mugs). He said it tasted like yard clippings like other green teas before walking off continuing to sip to not waste it. He comes back in 15–20 minutes later over halfway finished, “Did you put drugs in this‽”. “Nope.” “I feel like I want to run a marathon. Okay, I see the appeal for your mornings, but this is the worst high ever.”