Trying to sell to everyone. When your target is "anyone who might need this," you waste time on people who will never buy and miss the people who would pay happily.
BROAD targeting:
"Our product is for businesses that need invoicing"
Result: 100 conversations, 2 customers, $58 MRR
NARROW targeting:
"Our product is for freelance designers earning $75k-200k/year
who bill by project and currently use spreadsheets"
Result: 25 conversations, 8 customers, $232 MRR
Narrower targeting = more relevant conversations = higher close rate = more revenue from less effort.