To improve the CTR, You should follow following methods:
Your Website landing page should be good, Here is a famous quote, that “Content is King”. If your content is good then your visitor will stay in your website and they can visit again your website.
Should be Relevant: Website landing page should be related to page title. If page title is not relevant then your visitor will not stay in your page.
In each page relavent images should be placed so your visitor like your article more and visit your website again.
So these are the methods which help you can improve Website CTR.