A good way is to start a spreadsheet. You can categorize the suppliers based on ones you've reached out to, ones you're currently working with, ones who have declined you, and more. You can color code them based on category, MOQ, or any other way that you'd like.
Create something that works for you so you can easily identify certain aspects of a supplier at a glance like the one below.
How do I organize supplier information?
I don't remember who I reached out to.
How do I stay organized?