A trick to instantly help your essay sound much more academic is to learn to write passively and to avoid phrases that use personal pronouns.
I think that -> It is thought that
I believe that -> It is believed that
Our world today -> The current global situation (or) In today's world
To see this in action, take the following 2 sentences as an example:
(1) Our world today is unstable in many ways.
(2) The current global situation is unstable in many ways.