It’s been a while since I made it hard on myself and did a full-on campanella version but it suits this tune really well.
I’m not sticking to any strict pattern for the picking hand. It’s mostly either thumb on g and one finger per string. Or thumb covering g and C with index and E and middle on A.
Make sure you let the notes ring into each other as much as possible.
Single Note Version
The campanella version is way more difficult than it needs to be. So here’s a simple version of the melody.