It is appropriate that your capital of $ 15k be bought bitcoin, because until now bitcoin is the best cryptocurrency.
Compare to other crypto, bitcoin still the best choice if you are looking for long term investment.
If you look at the movement of bitcoin, I'm sure if you hold bitcoin the next few years it will generate huge profits.
That's very possible, especially of you bought bitcoin when many are selling it, if you purchased it when dumped
is ongoing, chance to sell it for much higher value.
So no need to hesitate investing in bitcoin, even though the price is volatile and has a high risk. But bitcoin is profitable.
You need to study and learn more about bitcoin first, before you invest make sure that you are ready and willing
to take the risk, it's very important in every aspects of investment.
The chance is all yours if you pay attention to every opportunities that will shoed up, grab and take advantage.