A dear friend was having trouble wrapping their head around complex interactions a while back, which they resolved by building a picture of what was going on. Diagrams and process maps brought clarity and understanding.
Another friend is just getting into D&D and had a loose idea for a character, but wasn’t sure how to flesh it out. Hero Forge Custom Miniatures offer a great online tool to create a mini that looks like the character you have in mind, and I’ve found that the process of designing the mini gets the mind rolling over options and possibilities quite naturally.
If you’re stuck, try to visualise it. Start small if that’s a struggle, with the scantest of detail. Step by step add in what you know or learn until a picture starts to form. As it forms, you’ll build momentum.
Kindly, keep going.