Received a payment with low fees, stuck already for 3,5 days now

[dkbit98]

Well yes but I did not send this payment to myself. It came from an external party and I have no control over their actions.
Can I still do something then to speed it up?

You can tell them to increase the fees if they used RBF or to send new transaction.
I checked transaction you posted, and they did use RBF, but it may need more time for transaction to be confirmed with 7 sat/vB fees they used.
Right now fees are going crazy but I would wait for weekend to see if mempool cools down a bit.

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[hosseinimr93]

Just enable coin control, select the unconfirmed input, spend it by sending to yourself, and add a significant fee.

You can do the same thing by right-clicking on the unconfirmed transaction and selecting "Child pays for parent". There is no need to use coin control.

Doing CPFP in this way is easier for someone without technical knowledge and the other advantage is that the user would see the effective fee rate before broadcasting the child transaction and wouldn't have to calculate that manually.

[GekkeBelg]

Just enable coin control, select the unconfirmed input, spend it by sending to yourself, and add a significant fee.

You can do the same thing by right-clicking on the unconfirmed transaction and selecting "Child pays for parent". There is no need to use coin control.

Doing CPFP in this way is easier for someone without technical knowledge and the other advantage is that the user would see the effective fee rate before broadcasting the child transaction and wouldn't have to calculate that manually.

Thanks, I did it like this and it was indeed very easy, and it succeeded. The transaction is now confirmed.

[PX-Z]

Just enable coin control, select the unconfirmed input, spend it by sending to yourself, and add a significant fee.

You can do the same thing by right-clicking on the unconfirmed transaction and selecting "Child pays for parent". There is no need to use coin control.

Doing CPFP in this way is easier for someone without technical knowledge and the other advantage is that the user would see the effective fee rate before broadcasting the child transaction and wouldn't have to calculate that manually.

Thanks, I did it like this and it was indeed very easy, and it succeeded. The transaction is now confirmed.

That's good to hear, i just checked the transaction on mempool.space it was indeed confirmed just 1 hour ago as of writing.

[Smartprofit]

Any experts here who can shed their light on this case? I received this payment about 3,5 days ago and it's still unconfirmed.
Should I be worried that it might stay unconfirmed forever or will it for sure be confirmed sooner or later? But realistically, how long can it take?

The mempool is so congested right now and it might take weeks or more that transaction can get confirmed. It might be dropped from mempool later. Why not tell the sender to increase the fee using RBF because the transaction supports RBF.

Do not accept an unconfirmed transaction until it has one confirmation.

You write about one confirmation...
I have always believed that it is necessary to wait for two confirmations of a Bitcoin transaction in order to have an absolute guarantee that the transaction will not subsequently be reversed. 
However, I recently received information from the exchanger I work with that they now determine the receipt of bitcoins based on the presence of three confirmations.  The address I am performing the transaction from is not a segwit bitcoin - address. 
I wonder what this is connected with?

[LoyceV]

You write about one confirmation...
I have always believed that it is necessary to wait for two confirmations of a Bitcoin transaction in order to have an absolute guarantee that the transaction will not subsequently be reversed.  
However, I recently received information from the exchanger I work with that they now determine the receipt of bitcoins based on the presence of three confirmations.  The address I am performing the transaction from is not a segwit bitcoin - address.  
I wonder what this is connected with?

It's based on the risk. If you receive one small transaction once, you're probably good. But if you receive many high transactions in each block, something may go wrong someday if a block gets replaced. By waiting for more confirmations, you largely reduce that risk. Bitcoin Core still recommends 6 confirmations by default.