As long as you invest, you'll surely gain profits. Buying bitcoin doesn't mean that you have to buy exactly 1 of it. You can just invest the money that you can afford. Though right now, transaction fees are higher but I think if you are thinking of long term you wouldn't have to worry for that. Just trust your gut and risk what you can. We are here because we love bitcoin and its services that it gives to us. Dwelling on it longer would just make you regret it later on.

Well, other than that, it depends on you if you really want to or not. People always ask that but most of the risktakers gain all those profits that they expect. Just be yourself man and be hopeful that bitcoin will rise and make a new record for next year.

note: Bitcoin's value is lower right now so I think it would make sense for you to buy now and hold to get profit for next years bitcoin results.