btw is there a reason why you need to change it to stable coin, if you're storing it for at least a year? why not keep it as btc? i also agree that hardware wallet is one of the best choice to keep your money. it's quite cheap for someone who has 3 bitcoin or more.

btw, as an alternative you can use rsk. first you need to convert your btc to rbtc, and then sell your rbtc to rdai, and then convert your rdai to dai with the token bridge. make sure you read about it first and test it with a small amount first, better be safe than sorry.

https://developers.rsk.co/rsk/rbtc/conversion/with-ledger/
https://tokenbridge.rsk.co/