Hair loss is very natural process. If you don't like something what nature created, you have to do it with "unnatural" things.
At this moment there's no proven methods to slow-down your hair loss "naturally". There's some anecdotal evidence vigorous scalp massages might slow progression of hair loss through promoting blood flow just like Minoxidil works (or at least that's what we think).
That being said you can try scalp massages (plenty of videos on youtube), but If I were you I wouldn't experiment with unproven things and having 50/50 chance to regrow or further lose your hair and rather go with something that is proven to work like Finasteride and Minoxidil as Bigmac mentioned.
In the end it's up to you what you will choose, but don't get upset after a year or two of trying "natural remedies" and just find that you lost much more hair.
My only regret is not starting finasteride 5 years ago when I was NW2/3, now I'm NW5a with little hair left.