From what I have heard - I have no personal experience:
Don't use too many Snapchat accounts with the same device, switch from Android to iOS, don't use the same link for more than 1 Snapchat account, don't use direct smartlinks, always use prelanders, don't use more than 2 or 3 Snapchat accounts with the same proxy IP, scale up your number of Snapchat accounts to reduce the loss due to bans, talk to the developers of Snapchat bots regarding how to improve your traffic and reduce your previous bans.