Looking For Pixel/ Dataset Expert

Hello, my name is David. Currently I am having trouble in facebook ads manager concerning pixels/ datasets. I know these two aren't exactly the same, but I'm not an expert here. In the ad in facebook ads manager, under Conversion, under Conversion Event, it reads, "Your ad may not be optimized for conversions because we haven't received any activity from your pixel in more than 7 days. To optimize for conversions: View Pixel Email Pixel Code Get help" Maybe all of this is in my head, but I feel like it is not working. I was getting conversions from my website and now I'm not. In Events Manager under Datasets there are triangle exclamation marks under Status and Event match quality on Pageview. Event match quality says 4.6/10 - Update recommended. When I click it, it shows everything as 100% of total events except email which says, "Email Hashed 7.69% of total events Coverage Meter" Last night, External ID had a low percentage, too but now it's showing 100%. I just want to be able to understand what is going on so I can fix it. I don't want to just hand something off and say, "Oh, go and do this." Then when it happens again I have no idea what to do. I'm really interested in learning about this, because I feel like it is affecting my ad significantly - how facebook reads it, understands it, and sends it out to the right people. Right now it feels like I'm just throwing money down a black hole, and facebook is driving in the dark.