Question for account managers

Currently in new logo sales for enterprise clients (SaaS). Only dealing with inbound leads. We’re market leaders and opportunity is slowing so company have decided to hire a bdr who has skill/experience in prospecting and I am to start account management.

I’m being expected to step up here and essentially develop the function within the business. The main goal is churn prevention. I want to give this my all but with zero experience in AM I’d really love advice, tips, tools (our company is really big on AI) to help me get this right.