You will likely be safe.
Nobody can say 100% that you won’t be banned because we are basically second-guessing Nintendo, but generally the only thing that people have been banned for so far is homebrew NSPs, piracy and cheating online.
There have been no confirmed bans for just using CFW (assuming you are using Atmosphere, don’t know about ReiNX) or system modules. This is based on over a year of monitoring what causes a ban.