It's not zero but it is signficantly less than last year. Is that what you are comparing it to? It looks like your traffic composition has changed. There is barely any Google search traffic now. Your top traffic source is DuckDuckGo, which focuses on user privacy, possibly resulting in lower bids from advertisers. Your overall traffic level also appears to be about 1000 visits per month, contributing to lower revenue compared with last year when your traffic was higher.
https://analytics.ezoic.com/reports/trafficSources/trafficSource