Hi Naman G.
Personally I launch personalised email campaigns. Basically I look for intent signals such as as open jobs, recent news etc - that may signify a need for my solution. Then I write a personalised copy around that plus how my solution can help.
With these emails there are a few rules I follow:
short messaging (I try to keep it under 110 words max)
Subject lines of 3-5 words max
These can be very manual so I build a clay table to automate it.
PS people are beginning to respond more to soft CTAs that offer more value than hard ones that ask for a call straight up