Is it possible to increase amperage and voltage?
Strictly speaking no... due to conservation of energy you can't sustainably put out more power than the plug will give you...

However, if you have enough charge storage, you can deliver that amount periodically.

EDIT BASED ON MORE INFO IN COMMENTS

If all you are trying to do is boost it to charge your laptop, then yes you could do this. The current would be lower and it will take longer to charge. It would be horrendously inefficient though... Assuming the initial convert to 5V is at 75%..another boost would bring you down to about 56%...