It is a good idea to covert all alt to BTC before this fork. I have invested in ETH and NEO and thinking of doing so to double all my BTC???
There is no such a thing as doubling your BTC. It's just you having (for example) 10BTC, which when a chain split has been initiated means that you also have 10S2X coins, but then on the Segwit2x chain of course. After that you can dump your S2X coins for BTC at whatever the exchange rate by that time might be. Currently, Bitfinex's S2X future sits at a value of around 0.14BTC, which basically means that with 10BTC, you'll have 1.4BTC worth of S2X coins. Holding Bitcoin is always a better option than holding an altcoin, but now you'll have a bit more incentive to do so.
