Don't listen to the sheep (no offense baaaahhhh) about putting all your money into Doge or Litecoin or spread your risk by buying 1 GPU coin, 1 CPU coin and 1 ASIC coin. There is no logical basis for any of that advice and comes from people that don't understand Bitcoin well enough except to provide heresay/rumour/snake oil advice on Bitcoin competitors (all the ALTs).
Also don't listen to the hype about moving your entire life into crypto currencies either as that would not be wise considering that the vast majority of the planet deals with fiat currencies (as imperfect as they are). There are definitely SOME people that are living entirely in this alternative universe of crypto currencies (like Bitcoin Jesus), but also understand that they probably watch Bitcoin value on a daily basis and have cold sweats when a major exchange is ready to implode (like MtGox for example). BTC value is inherently volatile, both in it's design and because it can't be regulated.
If you are prepared to spend 40k in this new frontier, then ask yourself if you are also prepared to spend the equivalent amount in gold or silver, or rubles, or yen, or any other globally accepted trading medium. Why not buy Coca cola stocks or Walmart or maybe buy a few shares of Warren Buffet's stocks? Or how about buy a piece of land in your city and speculate? Or buy a pre-sale apartment and sell for profit? Or how about invest in a startup? Or invest in your own education and earn more money? Or .. well the list goes on and on.
Bitcoin is still valued AGAINST fiats, and NOT the other way around (ie: USD are not valued in Bitcoins YET) so that should tell you that a tectonic global shift hasn't yet occurred in global Bitcoin awareness.
BUUUUTTT.. and it's a big one, even though it's VERY early days for Bitcoin, it's already at around 900 USD now.. and that's with the early adopters, geeks, crypto enthusiasts, and miners. Has that price been artificially inflated? Is the whole Bitcoin movement run by hackers and coders and greasy haired bankers?
Many people don't know what to do. Part of the reason for this hesitance is that Bitcoin is technically more complex then say USD. The basis for the currency (if we can call it that) is fundamentally different from everything else we have ever used before. It can't be centrally controlled, it can't be faked, it can't be double spent, and the entire spending ledger itself is public domain. It's almost as if someone took the central bank of an entire nation and posted every transaction for public scrutiny (a wet dream some still think will happen)
If all you want to do is grow your wealth, then it's probably worth listening to the 2nd richest man in the world who grew his own fortunes from scratch (so MAAAYYBEE he has something good to say? duh). On Warren Buffet's Investment checklist: Don't invest in something you don't understand.
If you are here asking for what to do with your 41k and if you should invest your money in Bitcoins (or whatever), then it's obvious you don't understand the implications of buying Bitcoins yet, so buy only as much as you would be willing to purchase in USD and freely give away to anyone on this forum (as a gift for example) and then keep researching.
Oh, also don't take my advice cause I'm a sheep too
What a bunch of crap. Researching and spending hours and hours trying to gain understanding won't enlighten, it's just going to cause more confusion. In the end no one knows squat about what is going to happen, including you.
OP - reading and asking the same questions everyone here is asking themselves is a waste of time. You have to decide what to do, good luck.
