For pre-cut ringtones that don't require manual editing, users frequently use:
host various fan-made and clipped versions of "Heri Sakhi" specifically edited to fit ringtone lengths. How to Set the Ringtone (Full Guide)
Because this is a specific folk devotional piece (not a mainstream movie song), finding a high-quality instrumental ringtone requires some effort. Be wary of generic "free ringtone" sites that offer low-bitrate (poor quality) MP3s or malware-infected apps.