It is important to differentiate between current visitors and target
audience. If your stats are able to, the important information is
return visitors and where they come from. There will always be random
visitors from all over the world, arriving via search engines. They
add to visitor numbers and page views, but what you need are visitors
that bookmark your site and use it as a resource. They are the
visitors who travel through many pages each visit, who read the
content, and who are in a better mood to notice relevant
advertisements. Many search engine visitors will only visit for a few
seconds then go somewhere else.
The advantage of Google Ads is that you get paid per click-through,
regardless of whether the visitor ends up buying anything. From this
point of view, it doesn't really matter where they come from - if they
can read English there's a 1-3% chance they'll click on an ad.
It is only an opinion, but aiming for an Indian audience, and treating
your site as a long-term proposition is what I suggest. This target
audience is going grow rapidly in the next decade. It is important to
be #1 at what you do. It is better to be the #1 Indian health portal
than the #37 international health portal.
I think each of Complementary Medicine, Conditions and Family Health
should be treated equally - the same amount of promotion from your
home page and the same amount of effort content-wise.