Here is a useful technique to overcome motivation inertia: commit to working for 5 minutes. By the end you will probably have a better grasp of the problem and will then feel empowered to continue.
It’s not 5 minutes worth of work, it’s 5 minutes of work. The difference is that the point of the exercise is not to do some small easy task, but to set yourself up to be convinced that as you complete the work it is getting easier.
Most things seem harder than they actually are.