You were fortunate to purchase five thousand Bitcoin, when it was only pennies a coin, and it's now worth a whopping $130,000,000. This is now sitting in cold storage in your digital wallet, and you want to cash out 100 million usd.
It's very simple to do, just know that you don't have to necessarily move the whole money at once, you can do it instalmentally and also if you're exchanging them with an exchange, then try to avoid the same bulkiness of sending or withdrawal at ones, you can also make use of a decentralized no kyc exchange and make use of the p2p network, there's whale alert system that also notifies of any giant move of currency, so in every decision you will be taking, don't just make it suspicious by making huge transaction that could be alarming.