Think about things deeper than the surface. Maybe think outside yourself, just a little.
If you want to sell 10 BTC and the rate on say Binance is $11,000 you can for sure sell your total btc very close to $110,000 USD. There will be some fees of course the price may drop a little or even go up a little, but I would say you can secure an average around the $11,000 easily. Great, this person I am not interested in.
Now try to sell 1,000 BTC or 10,000 BTC in this same situation. Do you think 1,000 BTC will not shift the market. The fee will be small again, but the price will fluctuate. Maybe you can do this over a period of 30 days or more, but where will the price be? You cannot be sure. Do you want to leave this amount of BTC on an exchange attempting to sell it. Maybe you will transfer every day 10 BTC to sell, sure. Worrying about losing your BTC going from wallet to exchange sound fun to you? What about the security of your fiat on such exchanges. There are many variables.
You also have to deal with taxes eventually (esp for US customers). We can solve the tax problem by working with you to open a bank account outside of US and other countries regulations. Minimum that will save you 20% conservatively.
That's wishful thinking, this is a forum of individuals and to loose 30 btc I would rather sell those 300btc at $11k each for 3 years rather than throw away $300k for a quicker exchange, in your reasoning would you throw away that kind of money just because you can get funds quicker? I would like to meet that kind of person.