Nepali searchers do something that breaks most keyword tools: they mix scripts and languages inside a single query. Deciding what to do about it is one of the first calls I make on any new project.
Three options
You can translate pages into Devanagari, transliterate into Roman Nepali, or write in English only. Most Nepali businesses should start with English, because that is still where the search volume and the buying intent overlap most.
When Nepali is worth it
Local services with an older customer base, government-adjacent information, and anything people search for while talking to family. If your customers are over 45 or outside the valley, Devanagari pages earn their place.
How to structure it
Keep one language per page. Do not put both on the same page hoping to catch everyone; you end up ranking for neither. Link between the two versions clearly and set the hreflang tags properly.