Individuals generally should not represent themselves at trial. They even more strongly should not represent themselves on appeal.
And they definitely shouldn't do both when they're running a shop selling marijuana, psilocybin and hashish. Particularly when the lawsuit involves a complex civil nuisance action and procedural matters (e.g., summary judgment, evidentiary rulings, etc.) that a nonlawyer probably won't know much about.
Especially if the pro se litigant is using too much of their own product.
No need to make things tougher on yourself than they are. Get a lawyer.