My plan was very sure what i would to do,hold my btc in wallet and do nothing.That is safest way.when the price increasing high i invest my btc into trade and other related business which one accept bitcoin.
If you have some bitcoins in your wallet already, I think it will be a great idea to increase the amount of bitcoins. For this, you don't need to do any sort of investment if you can't.
Bitcoins can be earned free of cost by some methods like joining signature campaigns, bounty campaigns, mining, faucets etc. Also, it is best to start trading with small amount when prices are low.