I do not know anything about Ghana, but I will make some general observations on this point. I hope this will be of some use to you.
Economics is, of course, very important for national development. It is impossible to develop as a country if you do not have an economy that is growing. A growing economy allows people to get better jobs, make more money, and set their offspring up to do better than they themseles have.
However, there are other things that matter a lot for national development. For example, politics matter. A country with an unstable or corrupt government is not likely to develop well. Corruption, especially, is a major issue for many developing nations -- one that makes it hard for them to maintain economic growth. Politics in developing nations are often unstable as well, leading to a great deal of uncertainty for businesses that might want to invest in a given country.