Hey @derek
For me personally, Apollo is the best tool for cold emailing.
Cold emailing is a process, and you need to be patient in order to get results.
The most important thing is to define your target as clearly as possible, Apollo has great options for this..
And the second part is to create a suitable email sequence, I would go with MAX 3 emails, sent in 2 weeks period.
Regarding the content, don't overload with heavy text, include bold text to highlight important things. If you worked with big names, mention them, or have some international awards...
IDK what is your product, but you can offer something for free that will create some sort of urgency. For example: 30 days free trials, or free website audit.... until xxx
P.S Warm up the email domain first, dont start with mass emailing right away (you might be blocked or flagged as spam)
Also, you can include links in the email, but dont go with more than 3. Avoid attachments.
P.P.S if you are targeting Europe, watch out for GDPR rules, and make sure to be compliant (always include an unsubscribe button in your emails)