Get more sleep.

In bum.

Tea bag between cheek and gum. Caffeine is absorbed transdermally.

NB its way more efficient than brewing, you will be zipping like you just took a caffeine pill. Learned this accidentally while camping.

Quit drinking all caffeine for two weeks to get rid of any tolerance.

Caffeine is borrowing tiredness from tomorrow.

Add more bags.

If you are drinking it first thing in the morning wait 90 minutes after you've woken up.

Drink more of it maybe? I drink both hot and cold brew. Cold brew has less caffeine but I can drink more of it, faster. Sometimes I have a cup of each at the same time.

At the end of the day, what you need to do is either drink a lot more of it, or concentrate it somehow.

Just guessing wildly (no idea if these ideas would work), but the best options I see are to cold brew it (put in water in fridge and let steep overnight). Cold brew coffee tends to be higher in caffeine than normal brew, so it might work the saw for tea. Might also make the tea insanely bitter, idk. Second would be to essentially distill your tea. After it's done steeping, take the tea out and boil it more, until most of the water is gone. Repeat a few times until you have a lot of boiled down tea and then drink it. This might get disgusting quick, but would be effectively the same to drinking multiple cups, just with less overall liquid.

Or, I suppose, buy a kilogram of pure caffeine powder and add a few mgs to your tea for an extra boost (maybe that's more acceptable than energy drinks?).

Hope these ideas help! Just some off-the-cuff suggestions I've never tried

Irish Breakfast tea like Barry's will caffinate you. Let the bag soak for 2 minutes for a normal cup. Two bags and 4 minutes and then squeeze the bags for a high octane cup. A little cream/milk (I prefer oat milk) and a touch of honey

🥰

Good stuff

Mix cocoa powder in, maybe a sprinkle of instant coffee, and some caffeine drops. Sweeten it with sugar. Don't drink anything else. Have some dark chocolate on the side.

I would take small sips over a period of time if you're trying to optimize for the length of time that caffeine remains active