You can probably get 10x in shorter time by buying new high-potential altcoins, still you need to explore this market well..
If you are not in a hurry - you can still buy BTC, we are the true believers, and we believe in $1M BTC in a few years, seriously.
Even $200-500K rate will give you some pleasant results.
And anyway you can reinvest your next $50 later as well

Good luck!!