They are just scams. You can ignore it unless your account is compromised. Scammers simply send thousands of such emails hoping someone would think its real and eventually pay the ransom.
This is a scam, while he's sharing specific details about the tools he used, he's not sharing any specific details on what he found, like favorite porn fetish or even some details from some sensitive documents he got.
The only way he's trying to be serious is by threatening to release things to your friends, that in negotiations is called point of no return.
The best way to get the message across is to share something sensitive like you jacking off to porn or a section of a bank statement.