1. you should have both builders going at all times in builder base, 2. use the force quit method described by many youtubers/guides resources are essentially infinite (100k/ min) 3. From a brand new account, it takes 77 days to get the 6th builder, u should get it within a month if u read a guide
If they just did these events after 1/2 months after releasing a new TH everyone would be happy I feel. They get their money from those who wants instantly max heroes, meanwhile the more casual playerbase can actually use their heroed