That's frustrating! If Google removed the Search Engine option from your AdSense, it could be due to a few reasons. Maybe there was a policy violation, low engagement, or just a change in how Google handles certain features. Sometimes, it's a regional issue too.
First, check your AdSense Policy Center—Google usually gives a reason if something gets disabled. If it's a mistake, you can try contacting support to see if they’ll reinstate it. Otherwise, you might have to look into other monetization options like display ads or affiliate marketing.
Did you get any emails from Google about this?