Tips to increase trust

What would you suggest to increase the trust in dropshìpping shop?
I have targeted traffic in my shop but I get only 1 sale per 200 visists.
The TRUST I mean the things like social proof or similar things? What are they? What are the most powerful ones?

use trust stamps such as SSL, logo's people are familiar with
use the words trust, promise, easy etc..
use pictures of smiling women
use a good designed websites, websites badly designed are untrustworthy

How about also sell your products on Amazon?
People will feel safe when they hear Amazon's name