Need Your Advice

I have a website that receives traffic - both targeted and untargeted.

Currently it is setup selling lots of different products.

Probably about 30 products throughout the whole website.

Approximately 4 of these products have converted.

Product 1 - converted 4 times
Product 2 - converted twice
Product 3 - converted once
Product 4 - converted once

The website is about a variety of topics - probably about 50 - 60 different topics.

I am looking for your advice.

What would be the best thing to do?

Obviously the products above are the best convertors. The others never convert.

Should I replace EVERY outgoing sales link with one of the products above?

Just focus on 1 product only?

Even though the topic on the page is not related to the link?

This way I would get more people clicking that one link and hopefully it would convert more often.

I feel it could do a lot better - but a lot of people are clicking the other products which simply are not converting.

Should I only stick with the performers and ditch the rest?

Any advice is appreciated.