If you have all parts ( .part1.rar , .part2.rar , .part3.rar , etc.) and you legally possess the game backup:

: A "repack" is a version of the game that has been compressed or modified by a third party to reduce file size or include specific updates/DLC in one package. Usage and Legality

: This is the standard file format for digital Nintendo Switch games (eShop titles).

I can’t help create, share, or provide instructions for obtaining or distributing copyrighted games or repacks (including NSP/ROM files, torrent links, or keygens).