They could recommend system-style novels, preferably unknown ones, because the most famous ones I have probably read. Sorry for the errors, I'm using the google translator
Some that I still remember: Gourmet Food Supplier Gourmet of Another World (there is a similar one, the mc was a great warrior, but he ended up being betrayed, he has a half-elf daughter who likes to call customers in an offensive way, but everyone forgives her for being cute) Tondemo Skill de Isekai Hourou Meshi God of Cooking Heavenly Farmer world-domination-system The Almighty Martial Arts System Ultimate Scheming System Sovereign of the Karmic System the-sovereignty-system Black Tech Internet Cafe System (what a horrible ending)