What is the severity of my baldness and nw grade? What is the prognosis or can I regrow hair back? (Photo)

Your biggest enemy is the progressive thinning
leading to a balding patter. The
degree of thinning that you are showing would suggest that you should see a
doctor who most likely will get Bulk Measurements of your hair to determine the
degree of the thinning that you are presently having. If the diagnosis is early
genetic hair loss, then the best treatment would be the drug finasteride which
is highly effective in men of your age and may not only stop the hair loss but
possibly reverse it. If you are developing a more advanced balding pattern the
the best test to get will determine the Bulk Measurements of your hair and this
will show, over a one year time frame, how effective the treatment will be.
Once you know this information, then you and your doctor need to develop a
MASTER PLAN which will define what you need to do over the years to come.

Hello, you have a fair amount of hair loss for your age.  It appears you are headed to a Norwood Type 6 or 7.  Assuming this is male pattern hair loss, as it appears, I would strongly consider Finasteride and Minoxidil as your first line treatment.  You might also consider a laser cap and perhaps PRP (platelet-rich plasma) therapy at some point.  I would urge you not to consider any type of hair transplant surgery at this time.  It will not serve you well in the future.