Need some help regarding my wallet

So I made a free transaction to OpenSea 2 days ago, starting with a minimum of 75 gwei for gas fees.

Naturally it didn't go through, so I started to speed it up slowly, each time by 5 gwei till the gas price was low enough for it to go through.

Yesterday I was trying to speed it up by another 5, but this time the new transaction didn't show up in Etherscan.

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I waited half a day and then decided to do another speed up with a slight increase in gas price.

The second attempt didn't show up either.

Someone suggested I should reset my Metamask wallet and I did that, but now my previous pending transaction is also removed from the wallet.

I can still see it by tracking my own wallet tho.

Here's the pending transaction I've been trying to speed up:

0x25ae6f92aae02ae320a0adf7ceefadfbfc725cb32c45ef46da4ac29fe4dc4be0

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Anyway, since now the pending transaction was removed from my wallet, I had to do a manual speed up.

So I made a new transaction to the same OpenSea address with the same nonce but a higher gas price.

It didn't show up either!

Then I thought the issue might have to do with my browser, so I switched to chrome, downloaded the latest MetaMask and made another new transaction with the same nonce and a higher gas price.

It still doesn't show up in Etherscan!

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They all have the same nonce, but for some reason non of my newer transactions go through.

I've waited for almost a day and there's still no sign.

What the heck do I do?

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Now I can't directly cancel the pending transaction and apparently I have no way to speed it up either.

What is this?