Broadcasting a transaction as a 3rd party
If you have send your transaction but it does not appear on the blockchain yet it mean it is still in the mempool, the place where transaction are waiting to be taken by a miner.
Miner incentive are to take the transaction with the biggest fees first, so yes you can &quot;double send&quot; your transaction using the same element but with an increased fee, so that it has more chance to be mined fast.
You can check this question for more detail:
When increase transaction fee three times in few minutes - transaction had an attempted double-spent?