​My Ex Boss made my life hell so I Join accidentally ‘took’ 3500 warm leads he spent thousands of dollars acquiring. Give me some startup ideas I can make money off of (Web Design and Al automation)

I worked at a remote startup which was basically a multi service agency offering Web design and development, Al agents and receptionist and a couple of more services.

My ex boss was basically a hell spawn who made my life hell from making me work for 12 hours to scolding me in team meetings even though I did exactly as he said.

Anyway, I lost my shit when he refused to pay me my months salary citing reason that my work was not ‘adequate enough to be compensated’.

During my last month there my boss wanted to expand and acquire more clients so he hired an agency to run multiple ad campaigns offering different services and collected warm leads of companies looking for the services.

The sales guy accidentally emailed me the lead list a week before and asked me to delete it but I kinda forgot to and downloaded it last second before they took away my access.

Now I have these high quality warm leads but zero ideas on how to make money off of them. Looking for a road map.

P.S : the company I worked for is from a different country hence I cannot enforce any contract and neither can my ex boss so there will be no legal issues.