First, if you are sincere and respect it, it will work.
Second, the clearer and simpler the problem, the better the effect. After all, lottery has its limitations, so it is suitable for asking good or ill luck, and don't expect detailed deduction.
Third, draw lots at will, not deliberately.
I have a lecture on "How to draw lots more effectively" at Himalayan Reading Network. You can listen to it if you are interested.