can I restore my foreskin (completely) ?

check youtube, lots of vids on this, nonsurgical methods appear to show results too.

No, some parts are lost, like the nerve endings and the little muscles in the tip, the scars don't go away, but it can look damn close to the real deal and protect the head like it should. It is generally not done with surgery but with stretching the skin.

No the parts that are amputated contain over 3 feet of arteries, veins and capillaries and thousands of nerve endings (well above 10,000). That will never come back. With that said the restoration by pulling is said to increase sensation of the glans.

No . If you try , you could end up with a weird looking penis so you are better off leaving it alone .

You can never 'restore' your foreskin, what is gone is gone for good.

There is no surgery that can give you a new foreskin. Some folk may suggest stretching the remains of your foreskin but this is a very slow and incomplete process. After many months, or even years, of embarrassing and uncomfortable stretching the best you can hope to achieve is a faux skin covering part of your glans. This will not look nor behave like an original foreskin.

The end will always be open and the faux skin will slip back and forth as you move about, giving you embarrassing unwanted erections at the most inconvenient times. The skin will admit and trap all sorts of dirt with the risk of both irritation and severe infections under it.

Your parents did you a great favour by having you circumcised as a baby. You should be thanking them rather than going on a wild goose chase to try to throw it back in their faces.

get a grip, Get your co ck some appropriate exercise as it is. You'll like it when you start to use it.