Family, friends, neighbours, old roommates etc. And yes, I wouldn't just immediately bulk send but copy and paste this email and do an individual one to each person or pick groups of people and customize it :). A bulk email is better than NO emailing. Write a short friendly email that says:

Hi {name},

{a greeting with some personal touch point...}

{Insert a sentence about what you're up to. Be succinct!}

{Ask them to connect with you on your socials and provide the links}

{Let them know that you're looking for connections and clients, and does he/she know of anyone who needs x, y, and z}

or

{Ask them for a recommendation of someone who you can reach out to}

or

{Direct call to action like "can we get together for coffee" or "can we ZOOM" etc etc?}

{Sign off}