Prospect first
Try to change your mindset to prospect first! Messages look (and feel) much better when you make it about them, not you - so try to use you and your instead of I, me and our. Your prospects will be much more interested in something they can get out of your product! You can try to use the #{{job_title}} custom field if it feels natural!

Solution for a problem
Address their problem, and propose a solution. Show that you know their struggles and express your understanding. You are the person who knows what may be a pain point for them, and you know how to make their job easier, spare them the stress and time.

Industry reference
​Mention some cool fact about your prospect industry branch - maybe some research results or some upcoming event, which can be a good background for your deal, but works as an attention-grabber as well!

Tone
Give it a casual one. Write like a buddy, not a salesperson. People get a ton of sales-related emails every day. The one that seems friendly might stand out enough to focus their attention.

Psychology
It's good to make your first impression a great one - take a shot to compliment your prospects. Mentioning their success, achievement or completion of a project will result in a better perception of your message.
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Research
A little bit of research about your prospect may give you the leg up. Maybe you have something in common with your prospect like you both attended a conference, or have the same degree. Finding a common ground with your prospect makes you more relatable and might intrigue them to open the email. This one happens to be a gamechanger when it goes down to establishing contact.