How I stopped spending 3 hours a day managing Twitter accounts (without getting banned)

Six months ago, I was managing 10 accounts manually. Every morning it was the same routine: logging in, checking emails, switching proxies to avoid looking like mass-following activity. Two accounts got suspended due to suspicious behavior. I tested a lot of different solutions (a separate residential proxy for each account, posting no more than once every 2 hours from a single account, a 5-day warm-up period). Now I have 100 accounts running stably with my own software, and it only takes me 30 minutes a day to manage everything. How many accounts are you managing?