Run a longer wire.

You just need to sprinkle metallic dust in the airflow and you're ready to surf the web at dangerous speeds!

I'm pretty sure thats unpossible, try a microwave and some garlic it should boost the signal, direct the antennas from the router to the most metallic part of the microwave and the microtextural bogoconductor + full-duplex planck magnetoms as well as the quantized garlic aroma should distribute the signal more evenly around the room (even through walls) than the antennas ever could. Trust me I'm an enginer I've trained for this moment my whole life

here's an illustration hope it helps and have fun with your better internet now!

source: reddit

Just buy a satellite dish off eBay and place it behind the router

Yes.

Speedy speed