How to change/edit transaction

I transferred an amount to Ronin but because of the fee (gas) it is pending more than 6 hours. I sent one more amount to Metamask to use in the gas and would like to merge with what I already have there and send it back, however I have to pay to cancel and I cannot edit a new amount on my order. What should I do? Can I send a new transaction with the new amount?

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