theory11 — Magic Tricks & the World's Finest Playing Cards
I think the 'best' approach is essentially problem solving. Identify an issue with an existing method, determine a possible solution, try it. If it works, refine it further.
One thing that I've done that has helped me greatly is keeping a physical notebook with me whenever possible. Then, when you get an idea, no matter how silly or impossible, you can write it down and maybe come back to it later. This helps me to not rule out anything, and has seriously helped with my creative thinking towards magic!
One last thing that has also helped is getting a more expensive notebook that I can view as treating myself when I get a new one. This encourages me to fill up the pages quicker than I would with a cheaper notebook so that I can get another funky notebook! I would recommend unlined paper so that ideas can flow nonlinearly, at least that's the way I look at it.
Here are a couple of videos I recently did on this subject! One of these is a creative bought exercise I recommend you try! It may be helpful!