eth_sendPrivateTransactionattempts to send your transaction to miners on every block for a maximum of 25 blocks. No need to listen for the next block. For more info about this method, check out the official Flashbots documentation.
tx: [string] Raw, signed transaction
maxBlockNumber: [string] (optional) Hex-encoded number for highest block number in which the transaction should be included.
result: [string] Transaction hash