If you don’t ask, “why this?’ often enough, somebody will ask, ‘why you?’
Do you treat most problems and situations as closed ones with set rules, rather than as open ones that can be played with?
If yes then sooner or later you are going to be irrelevant in your field of work.
Following rules and processes are useful but don’t let them become a mental block.
Creative thinking may simply mean the realisation that there is no particular virtue in doing things the way they have always been done.