I need help on a 24 hr unconfirmed transaction on blockchain
It's "normal" but it shouldn't be :/ https://blockchain.info/unconfirmed-transactions when this goes pretty high there is a large list of transaction that needs to process and the miners are selecting the transactions that have the largest fee density. If you want you can post your transaction here and I'll give a more detailed explanation for your specific situation. The good way to avoid this is to adjust your miner/transaction fee in consequence of the size of the backlog.