I’d start with one channel and just be very consistent. It’s easy to do more, but that’s actually a trap.
So not:
• More calls
• More budget
• More channels
• More personas
• More messages
Instead, think about how you can get:
• Better messaging
• Better user research
• Better personalisation
• Better conversations
• Better feedback loops
So I’d think hard about the problem you’re solving. How are you taking these vendors from A to B. What’s the dream outcome for them and how likely can you help them hit that.
I’d first focus on getting that message very sharp. Then share value around your niche at the places where people hang out online on a daily basis, and reach out to the people who engage with that. Plus reach out cold to people who you think you can help with that better message.
That’s just 2 channels. (1 long-term, 1 short-term).
Hope this gives some food for thought.