You might be used to receiving warm referrals or inbound requests for your product or service. In those cases, they either already trust you (referral) or trust your product/service (inbound).
With cold outbound, you’re approaching them. They don’t know who you are or if they need/want what you are offering.
Your sales cycle will naturally lengthen with cold outbound. More time for discovery, rapport, and trust building. More time to close.