BTSX is money.
Just riskier money (a la early stage bitcoin)
The answer to your question depends on how much risk do you wanna take?
You could just hold, and watch the value (hopefully) continue to rise.
You could trade it for bitcoin or something.
When bitAssets come out (soon) you could buy bitUSD. A risk at first because it might or might not work. But if it works having a bitUSD is like having a crypto equivalent to a dollar.
There's somebody here willing to sell you tampons, if you want.
You could send it to me. I like money.
What your asking us is basically "What should I do with my money?"
BTSX is basically an investment in and of itself. The currency is so young that theres not much else to further invest it in due to a still blooming infrastructure. I'm not sure why you'd want to further invest anyway, it would just increase your risk even more.
Don't like risk? Your best bet is to probably cash it out into fiat currency.