The amount of the fee depends on several factors, so you should take into account number of your inputs / outputs, current network load  -  the number of unconfirmed transactions.

You have 3 options on blockchain.com wallet :

- Regular fee, which mean that your transaction should be confirmed in 1+ hour.
- Priority fee , which mean your transaction should be confirmed in less then one hour.
- Customize fee, which allow user to set custom fee.

If you want to set custom fee then you need to check some sites that calculate fees, for example you might try using this calculator.

Blockchain.com is adjusting fees, but many user are complaining that that they are not very successful in this. Most of crypto exchanges have fixed BTC fees and KYC, and that fee is in most cases minumum 50 000 satoshi for BTC withdraw. Binance is not have KYC for withdraw up to 2 BTC, you can sign there for free and check their fees.