Expert linguists can also help, try to reach out to local linguistic universities (both teachers and students) and see if they can help to gather a diverse set of sound-diverse sentences in your language.
ⴰⵡⴷ ⵉⵎⵙⵏⵉⵍⵙⵏ ⵉⵎⵓⵣⴰⵢⵏ ⵣⵎⵔⵏ ⴰⴷ ⴰⵡⵙⵏ, ⴰⵔⵎⴰⵜ ⴰⴷ ⵜⵏⵢⴰⵍⴽⴰⵎⵎ ⴰⴽⴷ ⵜⵙⴷⴰⵡⵉⵢⵉⵏ ⵜⵉⵎⵙⵏⵉⵍⵙⵉⵏ ⵜⵉⴷⵖⵔⴰⵏⵉⵏ ( ⵍⴰ ⵉⵙⵍⵎⴰⴷⵏ ⵓⵍⴰ ⵉⵎⵣⵔⴰⵡⵏ), ⵜⵥⵕⵎ ⵎⴽ ⵣⵎⵔⵏ ⴰⴷ ⴰⵡⵙⵏ ⴳ ⵓⵙⵎⵓⵜⵜⵔ ⵏ ⵢⴰⵜ ⵜⴳⵔⵓⵎⵎⴰ ⵉⵎⵢⴰⵏⴰⵡⵏ ⵏ ⵜⵡⵉⵏⴰⵙ ⵉⴷ ⵎⵎ-ⵉⵎⵙⵍⵉⵜⵏ ⵉⵎⵢⴰⵏⴰⵡⵏ ⵙ ⵜⵓⵜⵍⴰⵢⵜ ⵏⵏⵓⵏ.