It looks like your seller double spent the inputs for this unconfirmed transaction... If he used a higher fee in the double spend transaction, chances are slim this transaction will ever be confirmed...

Also, the input for this transaction seems to be unconfirmed....

Loads of red flags for this one... I didn't dig to deep, but it looks rather suspicious to me (altough, it might still be OK, in case the seller just did a RBF), it's just a big web of double spending unconfirmed transactions, using unconfirmed outputs as inputs, higher fees, lower fees,...

A Bitcoin transaction is done for real only after it starts getting confirmations.
Until that point there are ways to "undo" the transaction (although it's not really undo, since the transaction is not done - not confirmed).
In this case your "seller" (scammer?) did a double spend. This means that although he sent you some money with high fee, he sent THE SAME money somewhere else with even higher fee. The transaction "to somewhere else" was confirmed and became the real one. Yours.. not.

Since the source wallet is now empty, I think that you won't get any money...

It seems that you won't get your btc in this case
Remember: never consider that you received a bitcoin payment until you don't have minimum 1 confirmation in bitcoin network.

PS: to accelerate a bitcoin transaction you can use:  https://www.viabtc.com/tools/txaccelerator/