Vana Blockchain Explorer https://www.hulkshare.com/maychen9/ So, when there is a large number of transactions from the mempool so you paid a comparatively small transaction rate, your transaction can remain unconfirmed for an extended time frame considering that miners/validators will find transactions with higher charges initial. The mempool basically queues the transaction https://listbell.com/story10446735/near-blockchain-explorer-ethereum-blockchain-explorer-fundamentals-explained-https-cutt-ly-3rj9ygbc