From my banevasion on serveral Arma 3 servers (GrandTheftArma, RebornRoleplay, Olympus , Asylum & Anzus) I do the following and have never gotten an automatic ban (banned due to rats
1. Different Steam Account (You can buy Arma 3 for £8 on Argentina VPN -> Use TigerVPN, its free)
2. Different IP, (BattleMetrics has a really good VPN List, almost every VPN is detected as seen here: https://gyazo.com/842b37d6ae9205420c55ddbcacf89ff4, and here its linked to my main account "EVAN", this is off BattleMetrics, i'd say change ip, call ISP or use 4G. or 5g if you have it )
3. New Arma 3 Profile. Go into documents, and delete Arma 3, & Arma 3 Other Profiles. This is what that had worked for me the past 6 months. only gotten banned of 2 accounts after a month. - information was provided by fall
voice changers i dont know much you could try something that just lowers the bitrate of your mic to make you sound different