Do you know about relative minors to a key. For example if you do a song in D then the main chords are D, G and A7. The relative minors quite often can add beauty and replace or supplement the main chords. The relative minors for D are Em F#m and Am also B diminished could be good.

If you want send me your email and I will send you a spreadsheet with all the relative minors for all the major keys.

Also what is the nature of your problem finding the chords? Do you know what chord the song starts with? I hope the relative minors will help you. You can also look up info on keys/scales and relative minors on the Internet.

The key thing to know is that within a given key the relative minors of that key can also be nice embellishing chords. So if I write a song in D I know that the D, G and A7 are the foundational chords (I-IV-V7) and often the relative minors can be added to the song to give it more detail and beauty--i.e Em or
F#m or Am.
I write worship songs too!