30.000+ Demand Gen clicks but very less website traffic

I'm currently running some Demand Gen ads on Google Ads. Initially, I used the Maximize Conversions bid strategy, but it ended up bringing in a ton of low-quality leads—definitely not worth it.

So I switched to Maximize Clicks to drive more traffic to the website, with the idea of retargeting the more engaged visitors through a separate campaign. The problem? I’ve gotten over 30,000 clicks, but when I check GA4, it only shows about 250 sessions. Something's clearly off.

Has anyone else experienced this? Any idea what's causing the discrepancy—or how to fix it?