I want to suggest you somethings which actually help you get some profits with bitcoins by investing. Try to trade with bitcoins price, try trading with altcoins, try to invest in HYIP and if none works invest some money in gambling site's bankroll.
There are many ways to invest but all strategies so far are not effective. HYIPs are risky you may lost everything you invested, Mining sites its hard to choose legit mining and your roi will take long to get it back, trading they say is best but its very risky if you do not know how, buying coins at ICO is a good thing but you must double check if the coins carefully, gambling in anyway is very risky in minutes you get bankrupt.
So the best investment strategy is investing not your coins and money but rather by your skills and time. Do signature campaigns, by just typing good topic with sense you will earn good. Next is get referral commissions, use your promoting powers to promote a site that gives you good commission.