Most of the times we do not know what causes the delay in transactions we made because we have little knowledge on how to avoid having any issue, it is expected that we take time to check the mempool for the current transaction fee rates, try to know this and check the confirmation time needed, this will give you the idea of knowing how soon it will get confirmed, also, you can pump the fee as well of using a wallet that supports RBF, since it was detected that you made use of a fee that could make your transaction confirmation get so delayed, just pump the fee and use the current fee rate for any category and it will be confirmed sooner.