GridsDev, just want to let you know, I finally solved the problem. I found this thread Can't ssh into my node and I used Rufus to re-flash my microSD card, re-installed RP4, and then I could easily connect. It was a Balena Etcher improperly flashing on Mac OS problem. I hope this will help more people who have the same problem as I did. I am so happy right now!
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