A CRO freelancer typically tries to improve the percentage of visitors who complete actions like purchases or signups. Their services will include site audits, funnel analysis, user research, A/B testing, and form optimization. They may also write new copy, suggest design changes, or help install tools like Google Optimize. Some specialize in specific platforms like Shopify, WordPress, or SaaS products. The scope depends on your goals and site complexity, but similar to CRO agencies, most freelancers handle both strategy and execution.