usually conversion is never a one way problem, but a mix of multiple things, and an agency can help you at certain things, but some things onky you can correct.
right audience targeting + right ad copy + exciting landing + a serious biz looking website + a unique reason or story that connect me as a user to buy from you, will make me place an inquiry with you.
so the first advise I have for you is break down your conversion funnel into 2 ie. - micro & macro conversion, and focus more on micro conversions like engaging with products, website content, product education, and how yo use kinda content.
more we can discuss later.
btw we do storified marketing campaigns to help growing brands likes yours find & retain best of targeted audience.