Product idea 🚀 validation: How To?

wanted to try some validation experiments.

1. cold email: so i plan to cold email 1.5k potential people with a discounted pre purchase
   (Not sure where to get these emails lol)

2. adding a link to the pre buy in quora signature

3. Messaging 1k people on linkdn

Tbh I don't know if 1k is overkill but I'll do it in sets of 100 per day.

If you have any suggestions/tips do let me know 😄

Will be building a simple landing page with waitlist and pre purchase