What are the best ways to market a b2b enterprise application pre-launch?

I'm spending a lot of time doing cold outreach on LinkedIn and starting conversations but that doesn't feel scalable. I'm about 25 responses for 110 messages.

My ideal ICP is b2b sales reps and sales leadership. I have tried starting conversations in seller groups on LI but little to no engagement there.

I think the most obvious would be to consistently post on LinkedIn and build in public but am hesitant because of those I am connected with at my 9-5. Management included.

What other options am I missing?

*note I am currently building MVP