Its good you have completed your graduation BSc Computer Science. Usually this undergraduate degree is three year course and the if you are opting for a job the pay will be according to the person who is a fresher. Since after completing a Undergraduate degree, the graduates are considered as the freshers and given a low salary. Its better to opt for a Post graduate like a Msc Computer Science and also opt for the computer courses from a reputed industries like NIIT, APTECH and some private computer centers where
these provide the good course knowledge in computers also. The postgraduate course usually comes for three years and after completing gives a good package for the postgraduate students. There are course like C,C++,C#, Java, Python,HTML,DHTML, ASP,JSP,Java Script,VB Script,etc...
Its always best to choose a parttime job while doing a post graduate course since you can acquire some industrial experience and also earn some money. Later whether you are interested you can enter into the field of the same parttime job move onto a fulltime job in the same field else choose something which interests you.
Data Science is also a good course where there should be more knowledge about the subject and the field. Data Science is used for the Scientist since this pays high in the industry where education is a base.
Digital Marketing is also a computer related course where it gives knowledge about the marketing in the online. Gives industrial kind of experience where there is always lot of competition. Its good tobe dynamic to learn this course since it requires computer and internet to work on it.