A master's degree is not a compulsory requirement. But it definitely helps to get a higher crs score. You can look for distance one year pg diploma courses from a recognised university to increase your score.
As per current trends you will need a score above 440 to get a sure shot ITA. This is achievable even without master's ( assuming you are under 30 and have 3 + yrs of work experience.). So try to increase your crs score by maxing out your ielts first.