イリヤの空、UFOの夏 and 人類は衰退しました. They will curse you to continue reading LNs forever in hopes of finding something as good as them.

If you want something recent/ongoing, then りゅうおうのおしごと！. For something that's only a single volume long, 紫色のクオリア. These are similarly cursed, so they're perfect picks for a newcomer.

If you want the MOST cursed series, then ミス・ファーブルの蟲ノ荒園. Not only does it embody the appeal of LNs perfectly, it's unfinished and cancelled! (This isn't really a serious suggestion, but the others are.)