I used to have a big problem with my shoes coming untied. I could double knot them, but I didn’t like the way that looked and it was difficult to undo.
The solution I came up with was to add magnets to the tips of my shoelaces and to the inside of my shoes. Thus the tips of the laces couldn’t move around and come undone. It wasn’t super hard to test, but I bought magnets, glued them to my shoe and then got stuck because I couldn’t find a way to get metal onto my shoe lace.
So I never solved the problem. I resorted to double knotting my shoes for a long time until I saw a very short TED talk where a man outlines how to tie a more secure knot. It looks the same as your typical knot, but it’s tied slightly differently and it’s much more stable.
Now I tie my shoes that way and they very rarely come undone.
For years I struggled because I didn’t test my assumptions about the knot! I made the situation way more complicated by adding 4 magnets to my shoe (I even pitched this idea in a business class and a group of people joined me on the project) rather than just learning a better knot.
Maybe the solution is just a slightly different knot. You never know until you try.