Sometimes I go on these little treasure hunts for obscure isekai titles and 'Isekai Kita no de Special Skill' is one of those that shows up now and then. If you want the safest route, start with official storefronts: check BookWalker Global, Kindle/amazon listings, ComiXology, and the big publisher platforms. Many Japanese publishers also serialize webcomics on sites like ComicWalker or individual editorial sites, so I like searching the Japanese title on those sites or following the mangaka on Twitter to see where new chapters drop.
If an official English release doesn't exist yet, you'll often find fan translations circulating on aggregator sites. I try to be picky about that — I read fan TLs to follow the story, but I buy digital volumes if a formal release happens so the creators get support. Personally, I keep a bookmark folder with legit purchase links and a separate one for fan translations so I can jump between them depending on availability and quality. Feels good to support the creators when I can, but I'm not above peeking at a fan chapter while I wait — hope that helps!