This gets to the heart of the creative process, which is not about being intellectual and theoretical but about physically creating something new that you and others can grapple with, seek to understand and develop.
Quite often, when we are doing our best to come up with creative ideas we can think too much and do too little.
Creating something new takes time and there are likely to be many false starts and unexpected obstacles that will need to be overcome. Obviously, however, until you physically make those starts and experience those obstacles you cannot begin to acknowledge, appreciate and address them effectively.
In essence, the more you think about being creative rather than actually getting down to doing it the longer the process will take! So the next time you need to generate new ideas begin by physically creating or doing something you can build upon.
Simply make a start and take it from there!