keep it lowkey
don't do more than 2 accounts on one proxy per month
even if they tell you to do more and get greedy
don't do that
100 proxies should be 100 countries
don't get 100 proxies from 10 or 20 countries
get them from 100 countries
so for 1000 proxies you'd have 10 proxies per country
1 domain per 100 proxies (200 accounts); use redirections from sites like web 2.0 and github; hide all your links; redirect bots to some popular sites
maintain many ISPs, ASNs and subnets - the more, the better
keep focus on one website - the more you test, the better you will get - don't give up after one year
attack from many angles - comments, posts, videos, livestreams, influencers; fresh, aged accounts; see what sticks and scale that to the limit
split test networks - remember it's not very stable and one week network A will perform well for country X and another week network B will perform well for country X; rotations happen all the time