1. Headlines
Your headline is very important and can determine whether the visitor reads your content or bounces straight off the page/website altogether.
2. Call To Action (CTA)
The words/tone used, colours, positioning, size etc. of your CTA can make a huge difference to whether your visitor performs the desired engagement.
3. Images, Audio, and Video
Do different images/videos engage more than others? Does a video that plays automatically grab your visitors' attention and keep them on your page more than one where they have to interact with it first in order for it to play?
4. Layout/Design
Your content might be excellent but if it's hard to digest your visitors may not stick around to read it. If you're selling something your visitor wants to purchase but it is unclear how they proceed to do so, you may lose them without making the sale.
5. Contact/Booking Forms
Is all the information you're asking for necessary? Is your form overly complicated? Is there a way to simplify or shorten the process such as AB testing facebook login or postcode lookup?
6. Content Length
Testing the length of your product descriptions, articles, blogs, FAQs etc. can all have a difference to obtaining the level of engagement you're trying to get from your visitors.