If you are struggling to find chords for the bridge of your songs – try taking the chords from the verse or chorus and swapping them around.
What’s the bridge for?
The purpose of the bridge is to provide respite from what has gone before – a contrast. That could mean a change of energy, rhythm, melody, sound, key, mood or tempo. It is not just about using different chords.
The bridge usually comes after the second chorus. It does not need to have words, but if it does, the words can be used to further clarify the songs theme or point.
If you are stuck, seek out songs similar to the one you are writing and work out how the songwriter solved the same problem.
Further study: How to write a bridge for a song