Blockchain.com issue
Oops! Something went wrong while executing the BTC on-chain transaction.
Blockchain.info forgotten password
Blockchain.com - Makes things difficult to send BTC, am I the only one?
blockchain.com - options not available
Take a look at the Web Wallets sub-board and you will find many more (I picked few topics randomly from the first page!)
Since you have already imported your private keys into blockchain.com, they are no longer cold wallets! I highly recommend creating a new wallet with Electrum and sending the remain coins to it. Check this guide if you want to use Electrum as cold storage:
https://electrum.readthedocs.io/en/latest/coldstorage.html