Or you've been searching your own terms so many times that Google's deemed it irrelevant - since you shouldn't be clicking your own ads - and now it's serving you competitor placements instead. what do your auction insights actually show? Where exactly are you losing search impression share? even if competitors seem to be everywhere, what do your own conversion metrics look like?
From a deliverability perspective, impression share is your inbox placement rate for paid search - if you don't know which slice of the auction you're missing, you can't fix it. Audit your campaigns the same way you'd audit a cold email domain: check the data before you blame the algorithm.