1.- Use any exchange that let's you buy BTC and send it. 2.- Send it to your cold wallet/ledger. 3.- Hodl.
You better use a Bitcoin only exchange like the cash app or swan.
Also, never sell. Just buy stuff to take profit when you want to.
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1- buy BTC on reputable exchanges (FTX, Celsius, Mt Gox) 2- lose it, move to shitcoins and buy them on other exchanges, lose them 3- repeat until you run out of Fiat
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