Voice searches related to local businesses are primarily "near me" searches. Two major factors contribute to your results:
1) the proximity to the searcher, and
2) featured snippets, also known as position zero.
The results for our voice searches are mostly the featured snippets that we get on traditional searches. Google relies heavily on knowledge graphs and rich snippets to answer voice queries.
Searchers want quick and immediate results, and Google understands this. The same applies to voice search as well, where direct answers are the priority. These direct answers are read back to the questioner to give instant results.
Therefore, optimizing content for SEO and featured snippets significantly increases your website changes in being the result.
To learn more about about voice search optimization, visit: https://www.semrush.com/blog/voice-search-optimization-7-seo-strategies-to-rank-better/