I want to make sure that there will be no trouble if somehow my site will be accessed by 1000 or more concurrent user using DNS +proxy.
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Nope, no concurrency limits for requests (especially DNS). Feel free to have 1,000, 100,000 or a million concurrent 
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in free tier? Do I need to pay for Argo?
Yes in the free tier and nope, no need to pay for Argo.
Argo Smart Routing is to improve performance from Cloudflare → origin rather than users → Cloudflare. Docs: Get started · Cloudflare Argo Smart Routing docs
For making sure again, my site request size is about 100~200 request/s will it be safe?
Yep, that’s fine.
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