My best investment strategy is to make myself well-established and educated. The money that I will make from Bitcoins will be used to fund my thesis and to buy me the gadgets that I need. I'm basically funding myself of the expensive stuffs because I have no one to ask for money. After I graduate, I think I'm still going to maintain my account in this forum for signature campaign, that'll serve as an extra income aside from my future day job.
Sounds like a wise strategy. It is always best to invest in yourself like using your earned Bitcoins as money for your education and self development. As for me, I have been doing nearly the same saving some amount of my BTC in order to invest it into a certification such as CBP, and Java 8 certification. Once I graduate and obtain my Bachelor's Degree in Computer Science, I will have quite an advantage by being certified already. This is not too far from becoming a reality.
Also, I've been looking for ways to diversify my investments such as sparing a few BTC into some alt coins like ETC, ETH, MaidSafe, and LTC.