Before the interview, go outside and look up towards the sun with your eyes closed.

Feel the warmth of the sun radiate on your face and body. Take deep breaths, but hold your exhales until discomfort.

This will trigger your body to wake up and be alert.

The holy trinity of mental clarity is to take a hike, a shower, and then a nap, cyclically in that order. Best advice that ever reached me. I explain it here, but basically it's like companion planting: hikes get energy flowing and help with exposure, showers/hydration get rid of impurities and inspire epiphanies (I guess the mists do this), and sleep allows your mind to rest but also wander with all of that. If you can't do one, do the other two (caffeine is not good for people, that "wakefulness" is just a high).

Or you could always be like Satoshi Tajiri during his interviews and wing it based on 24 hours of no sleep (he would help with making games for 24 hours and sleep for 12 and repeat the cycle, he even had his bed at the Gamefreak HQ for a time, and one time the BBC or whatever caught him during the end of the 24 and was like "is this a bad time").

I've an interview schedule in few hours as well.

Try taking cold shower and a coffee afterwards.

How do you make yourself feel better after a poor night of sleep?

What I do, I definitely wouldn't recommend. It's definitely unhealthy.
If I feel weak and shaky, I'll dissolve like 15 teaspoons of sugar in a cup of water and drink that. Then flush that down with extra water. Obviously only if I don't need to go anywhere, otherwise I wouldn't drink a lot of water.
But maybe it's not that bad. To be honest, I have no idea how much sugar is in regular soda.

Not a good answer, but I would try to reschedule the interview.

Otherwise a power nap and/or a cold shower. Plus no food.

A little bit of exercise can help. Go for a jog or something

I take kratom. Really wakes you up and makes you feel mentally quick.

Obviously won't help you now. But in the future you can be prepared.