My website seems to be under attack. Any suggestions or recommendations?

I'm facing heavy amount of traffic on one of my websites. We spoke to a few cybersecurity experts, and following are the replies that we have received:

1) DDoS
2) Bot Attack

The website is having such a heavy load that it starts giving errors (502,520,522). The server load is almost always at 100% and the website takes more than 30-40 seconds to load (if it loads).

Some are even saying that it's human traffic. However, from having around 10,000 …

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