Leverage out-of-the-box Salesforce Field Service Multiday Service Appointments1. This is a simple and efficient way of scheduling service appointments that last for more than a day.

governance is the process of defining and enforcing policies, standards, and best practices for managing your Salesforce implementation. It helps you ensure quality, consistency, security, and compliance across your multi-cloud solution.
https://trailheadacademy.salesforce.com/classes/arc801-Design-and-implement-b2b-multi-cloud-solutions

Experience Cloud2. This way, you can create a service-focused community for your customers using Experience Cloud Sites. You can also customize the look and feel of your community and integrate it with other Salesforce products and features.
Omni-Channel with defined presence, routing configurations, and Service Channels3. This way, you can manage your service agents' availability and workload across different communication channels such as email, phone, and chat. You can also use service channels to define which objects and records are routed to your agents using Omni-Channel.
Customer Community with Live Agent23. This way, you can enable chat support for your customers in the community using Live Agent. You can also configure chat buttons, invitations, pre-chat forms, and other settings for Live Agent.

Salesforce Sales Cloud is the system of record for the sales process because it contains information about opportunities and opportunity products, which are used for forecasting and reporting. It also integrates with other clouds such as B2B Commerce and CPQ to support the cart-to-quote process.
https://help.salesforce.com/s/articleView?id=icx_b2c_crosscloudengagement_systems_of_record.htm&language=en_US&type=5