Best way to sell my crypto (large amount) in order to avoid issues with banks and exchanges

Not sure if this is the best place to post but here it goes if anyone can provide some insight:

I have 500k worth of USDC sitting on my metamask wallet from various defi trades throughout the year. I would like to transfer it out and onto an exchange that can swap it to USD so that I could then transfer it to a high yield savings account. I would obviously be paying taxes on all of this.

I have a coinbase account I've used for 6 plus years and have bought and sold crypto with as well as transfered USD to and from my Wells Fargo checking account. But never an amount as big as this ($2000 was the maximum I have withdrew in USD into my checking account).

I have never handled this kind of money and don't want to make some sort of mistake like setting off some sort of red flags at coinbase or my bank account and then potentially losing all of this money.

Thanks for any kind of info