You just got unlucky!
Really really unlucky!!
You've sent your transaction when the mempool was quite empty and normally the tx would be accepted but just then a wave of transactions hit the chain, see the red circle.
~snip
Thanks for the graph, I want to ask some questions about what will happen those unconfirmed transactions around 1-6 satoshi/byte or more than that area, that is still unconfirmed?
Are those transactions will get confirm or will be back to every wallet of the sender? Like the transaction will fail since the transaction fees are too low. Is something like that? or they will wait until the transaction fees will drop around 1-6 satoshi per byte?
I think they'll get confirmed eventually. At least, I've never had or heard of a transaction that actually didn't get confirmed and the money being returned. Back in 2017 when the fees were very high, a friend of mine ignored them and sent BTC with a significantly lower than recommended payment. As a result, her transaction was stuck for a very long time. I'm talking about a month long or something. But eventually, the money reached the recipient

. I guess it was because the hype was over then, and the fees dropped. Back then we also tried some of the existing methods of trying to draw the attention of the miners to the transaction, but it didn't really work.