This song by Ariel Rivera is in E and F#.
Part 3 is the transition, where as Part 5 is the ending.
These are the “cheat” chords I played…
Part 1a: E - F#m7/E - G#m7 - E11/B - E
Part 1b: A - B11 - EM7 - E11
Part 2a: A - B/A - G#m7 - C#m7
Part 2b: F#m7 [...]