Hi Julia - I work for Reveneer - We work with a lot of clients with your same target market / buying persona
We follow a phone first approach here in the U.S.
If you think it would help - happy to compare our current metrics with yours (connect, conversation, scheduled, delivered % rates) specific to your target market / buying persona - and discuss different strategies in the US
Could be a few different issues just based on what you said and I'd have to learn more about your offering and what your doing today
but could be data, messaging, number of calls, time of calls, tone, pace etc
Let me know if you would want to discuss further - Happy to help