What are your tips to make an Upcoming page popular?

Take the time to fill out all of the details. Add a unique logo, choose a background color or image that is not the blank default. Share your page with your currently followers, friends and family. There are a few articles written by the PH team that are useful like this one: https://help.producthunt.com/en/...

Great advice @husseinyahfoufi I would also add to communicate with your subscribers. They subscribed for a reason, don't forget about them! Ask for referrals. If people find value or think something is cool, they know others who will think the same.