Note that "Chapter 2.5" is often a bonus or omake chapter included between major installments. If it is not appearing on your usual sites, it may be integrated into the volume releases or listed differently on the official platforms mentioned above.
If you are looking for the source material, the story is available for free in Japanese on Shōsetsuka ni Narō .
The manga is officially serialized on Comic DAYS and Pocket Shonen Magazine (Magapoke) , which often provide the most current raw releases.
勇者パーティを追い出された器用貧乏 ... - ニコニコ漫画
Finding a specific "raw" chapter for Yuusha Party wo Oidasareta Kiyou Binbou (English title: Jack-of-all-trades, Party of None ) on unofficial sites like Manga1000 can be difficult due to frequent domain changes and regional restrictions.

