#1 biggest mistake these so called "Conversion Rate Specialists" made is presenting a bunch of opinions and calling them facts. Unless there is statistically relevant data presented that shows how the tactics recommended led to an actual lift in conversions or some other desired outcome, they're just the unsubstantiated opinions of someone trying to sell you something. In this case landing page "Optimization" services.
> If the title contains a gratuitous number or number + adjective, we'd appreciate it if you'd crop it. E.g. translate "10 Ways To Do X" to "How To Do X," and "14 Amazing Ys" to "Ys." Exception: when the number is meaningful, e.g. "The 5 Platonic Solids."