管理人体調不良、モチの低下等により継続は不可能と判断しました。

、。

Due to the administrator's poor health, declining motivation, and other factors, continuation has been deemed impossible.

Literal

Administrator health-poor, motivation [possessive-の] decline [etc.-等] [due-to-により] continuation [topic-は] impossible [quotative-と] judged.

A terse website/service shutdown notice. モチ is a casual abbreviation of モチベーション (motivation) — common in internet Japanese. The formal ~により and 判断しました contrast with the abbreviated モチ, creating a mix of bureaucratic structure and casual vocabulary typical of hobbyist administrators writing official-sounding announcements.