If u are adding to a group, add 25 per account every day, try to add to old groups but if u add to old groups, don't add more than 400 on the statistics of the group (if u add 400 like ~100 will leave soo u it will look like u added only 300)
use proxies preferably from the same country as the sim, if u use virtual sims for adding, don't go for the cheapest sims cuz they get the most bans, explore different sites and countries, UK sims work the best for me from sms-activate.ru or 5sim.net.
If you have any questions, u can talk to me on TG: @TeleGroupOwner