If you have some sort of specific skills along with high degree of knowledge, then that would make it easier. To boost your online earning, you'd want a decent and not an underpaying kind of job, so answering survey or clicking ads won't do. You'll have to be an internet Freelancer. Yes, that means you'll have to be competitive among many other freelancer, making your way to get hired on that certain job. Noted that, this specialized job has generous reward, which will be worthwhile to do. Two of the legit freelancing sites I'd recommend for you is Freelancer.com and Upwork.com Good luck!