As long as you don’t have pirated stuff, impossible themes, or anything else ban worthy, and never installed/done any of those on the Switch before.
Also, make sure between the times you’ve gone online, this instance isn’t considered a ‘downgrade’ from the last instance. (Some amount of stuff is only legitimately supposed to increase, not decrease).
I’ve been using my CFW Switch on Sysnand online for years. No issues. Of course all at your own risk tho.