there could be many reason for that: your creatives are no longer good enough, your competitors stole it or they have better ones, the FB algorithm, audience's interest as well... many... Let just create more and test moreRecently, when I run ads on Facebook, the bid per message increased 5 or even 10 times. I tried creating a new campaign and reactivating the old campaign, but the results remained the same.
With that product, there are many competitors, so when they start an advertising campaign, Meta will allocate the entire customer file to them. That is the main reason why our advertising campaign has increased bidRecently, when I run ads on Facebook, the bid per message increased 5 or even 10 times. I tried creating a new campaign and reactivating the old campaign, but the results remained the same.