What are some possible passing notes for this song I am working on

 1 + 2 + 3 + 4 +   1 + 2 + 3 + 4 +   1 + 2 + 3 + 4 +   1 + 2 + 3 + 4 +

---5---5---5---5-|---5---5---5---5-|---5---5---5---5-|---5---5---5---5-|

-3---3---3---3---|-3---3---3---3---|-2---2---2---2---|-2---2---2---2---|

-----------------|-----------------|-----------------|-----------------|

-----------------|-----------------|-----------------|-----------------|

-----------------|-----------------|-----------------|-----------------|

-----------------|-----------------|-----------------|-----------------|

 

 1 + 2 + 3 + 4 +   1 + 2 + 3 + 4 +

---2---2---2---2-|---2---2---2---2-|

-0---0---0---0---|-0---0---0---0---|

-----------------|-----------------|

-----------------|-----------------|

-----------------|-----------------|

-----------------|-----------------|

The last part right there ^ leads back into the very first part. But I know I am missing something in there and I need some passing notes to lead from the last part to the first part. What could I put there that sounds good ? It really should be all notes because it is done on an acoustic guitar (or extremely clean sound) so nothing fancy. I use alternate picking for it starting with a downstroke. What should I put there ? I don't really think chords would fit right with these higher notes.
A question: is the timing 4/4 ? 8 Notes in the measure but the + notes are like a quick in-between note.

EDIT: Might be best sounding to play everything once, don't play 8 beats, play four, except for the last one
Any ideas let me know, thanks !