While you mentioned MANGA1000, these types of sites frequently change domains due to copyright issues. If the chapter is not appearing there, check other raw providers like MangaZip or Rawkuma , which often host the split-chapter formats (like "2.1") common for web-serialized manga.
The manga is serialized on the Gaugau Monster platform. You can typically read the most recent chapters for free or via a point system on the official Futabasha / Gaugau Monster website. While you mentioned MANGA1000, these types of sites
You can find the latest raw chapters of Kazoku ni Yakudatazu to Iwaretsuzuketa Watashi ga, Mashou no Koushaku Kishi-sama no Saiai ni Naru made (家族に役立たずと言われ続けたわたしが、魔性の公爵騎士様の最愛になるまで) through the following official and secondary platforms: While you mentioned MANGA1000