There are many ways to earn with bitcoin like gambling, investing and trading. It's up to you how to make a bigger profit, but to be sure you must set a plan, do some research and always be updated about cryptocurrency news.
All that ways risk but Gambling is very risk as you think although the profit earned is great. Trading is probably one of the best ways to earn a monthly profit. With that capital I think that is enough to start trading some altcoin. The risk is also not too big than gambling and investing.