There are multiple strategies you can use during /after/before Bitcoin fork event. Here's some of them, that you might find helpful.

Buy Bitcoin get Bitcoin Gold

As you all know, you can buy Bitcoin hold it until October and then sell it along with your Bitcoin Gold. There's going to be huge volatility in the market as people have experienced Bitcoin Cash. Initially, Bitcoin Cash was worth about 1500 USD, so those who sold it early got lucky and the rest of them got stuck there.

So, a lot of people will keep that in mind and try to sell it as early as possible, after all the KING is Bitcoin.

Buy Altcoins before the fork

Since people are cashing out of their altcoins and buying Bitcoin you can take advantage of this opportunity and buy your favorite altcoins cheap.

At the moment altcoins are very under-valued and it return some very good profits in case you can get a hands on it as early as possible. Just in case you are new to cryptocurrencies or for any other reason does not know where to invest you can try my list of altcoins here

Buy Altcoins after the fork

Since you have made money from Bitcoins increased value and from the Bitcoin Gold you can buy Altcoins cheap since the prices dropped due to sell offs. I believe altcoins will stay low for about a week after the fork. As last time Bitcoin rose to $5000 after the fork happened. Who knows where are we heading after 25th of October. There's a chance of potential rise in Bitcoin value. And if it rises, it would be another landmark achievement for sure.

Hold Bitcoin Gold

You can also hold Bitcoin Gold for a while and wait for it until it grows in value. I don't know why but I am more positive about Bitcoin Gold's success than Bitcoin Cash. There are a lot of Miners waiting for Bitcoin Gold. In fact, it may just split the ZCash miners in two. So, yeah Bitcoin Gold holds more potential than Bitcoin Cash.

If I were to invest, I would either go for 'buy altcoin' or 'buy altcoin after the fork' strategy. I think you can make a fortune on the altcoins during this chaos and uncertainty.

I hope this helps you.