Nobody will tell you a profitable business if they have it because it will get saturated. But let me tell you a trick, anything/any profession can be turned into a profitable business, all you have to do is niche in your field become an expert and offer your services. For example if you learnt computer science, CS at an overall field is very competitive and there are a million people like you, but when you niche down to like for eg, datascience and then try again your competition is slashed significantly and you are more valuable to clients. Another example is if your field is Accounting, half the country is full of accountants but if you niche to something like forensic accounting then suddenly you are proficient in sth that isn't available in Ethiopia (but in demand because of the new capital markets). So I hope you understand my idea.