It's not less, it's different.
Once again, my Celtic harp has proved that it's not a lesser instrument, it's unique and interesting as a "real instrument".
When I started harp lessons, my teacher considered lever harps to be student harps, a stepping stone to a "real harp". She didn't have the idea that it held its own possibility and strengths.
I had an inquiry for a 60th anniversary party. My prospective client went to my website and listened to the sound clips. She chose the Celtic harp because she preferred its voice: lighter, more "fun", she said, more in character with what she wanted the party to be like. The pedal harp sounded "too formal" to her.
I encourage you to consider pedal harps and lever harps to be fully capable and interesting instruments. Each offers something the other does not. Both will delight an audience.
Here's some free sheet music for small harps to download:
Pachelbel Canon - This is a skill building arrangement - you'll gain facility with root position triads (a common chord shape) and will need to be able to place an octave with the right hand. Some fingerings included.
March Napolitaine - fits a 22 string lever harp, C-c
Sweetheart Waltz - a skill building arrangement with a video here to get you started.
Here's an easy version of Were You There? with the hymn played twice, and Still Waters as the interlude between the two verses.