The most CRS score increases will happen due to following (in no particular order):
Good IELTS score
A Masters degree (preferably in Canada, or even in the US, as long as you can get Canadian-equivalency ECA for that).
Canadian job offer, either transfer or new offer from Canada (probably the best).
If you just finished your bachelors and are below, say, 28 years of age I would highly recommend either trying for a job offer, or getting a masters degree, preferably in Canada.
With only bachelors and highest possible IELTS score, a 25 year old single person with 2 years of work experience outside Canada gets 416 points on CRS calculator. Not nearly enough to crack the cutoff. A Canadian Masters is going to give you the ability to kick start your PR process, and you can also work side by side while getting Masters. Or you can find a job/transfer to Canada and apply under Canadian experience class/PNP.