It's impossible to never meet the hero because as his/her strength grows and grows, his/her influence will be worldwide. You'll have to face the hero at some point. It's best you kill the hero when they are weak and/or young. Your advice is not helpful. There's the option of not being "greedy" and not trying to expand your power or sphere of influence, but ain't nobody got time for loser talk like this, conquest is where the big boys play. Honestly, all villains should just sacrifice thousands of people before they embark on the villanous path. Sacrifices to a dark god so that they'll be pleased and tell them where the hero will be located at their weakest. Then you just nip the bud.