What is the best channel we can use to build community to get more upvotes?

You can use https://upvote-bell.com/leaderboard to get a list of relevant hunters. It also works well to extract people who upvoted similar products and connect with them using Phantombuster

We've built a community around our product on Discord, it now has almost 20k users a year later. Here's a spreadsheet of over 100 makers who will support with upvotes, in in return that you support theirs when they launch. docs.google.com/spreadsheets/d/1ViMpPoFHsClkK8jV5N2zOzshyjYU4mQIFPSs9sb4P4A/edit?usp=sharing