Different numbers in console and analytics, am I getting blocked?

Two of my domains have had more than 50% dropped traffic in the last 2 days.
I thought it may some kind of an indexing problem or some algorithm update, but nope.

the search console numbers haven't dropped, but the coming traffic along with conversions is down more than 50%.

I think many people are getting blocked from entering my sites. How can I check to see where the problem is?

Just keep watching at the upcoming traffic and as the problem won't stop then again submit your website to search engines. Another indexing process will help with this.