Usually, they hold withdrawal 3 to 5 days after the transfer from the bank account to your Coinbase account.
But it seems your BTC stuck on Coinbase for 14 days the same as what happened before around 2018 there are lots of people who experience this issue before
Look at this topic "
14 days waiting period after purchasing bitcoin with bank account"
You might be living in the US or EU where they raise their security or confirmation for bank transfer from EU or US banks.
We don't know if the BTC will increase in price again soon there is nothing we can do Crypto is always volatile and no one could predict what will happen next.
If you don't want to lose more much better withdraw them back to your bank account or if you still want to transfer it to another exchange to buy that coin then go ahead and wait until May 21 to transfer it to Bitmart.
