you can sign off no matter if youre a system or not, if it makes you comfortable. if you have a single set of name(s) and pronouns you use, you can sign off, just be prepared for people to ask if youre a system. if you have fluctuating names/pronouns, you van sign off, and specify that youre not a system. and if youre a system, you can sign off, though its not required. whatever floats your boat ^^
/g /pos /lh
-indigo // they/blue/pup/it