Lack of access to new information doesn't limit the ability to be creative or to solve problems. A lack of time spent reflecting or iterating on your thoughts. Examining them. Going over the idea one at a time. This is the limiting factor.
Developing a habit for metacognition can improve your ability to think critically and problem solve in general. By practicing metacognition you'll recognise patterns in your thinking, see shortcuts and improvements you can make, and notice problems in how or what you are thinking.