This question is about project manager skills.
The best way to manage multiple projects is to stay organized, prioritize what is urgent, and block your work time. A huge factor in managing multiple projects is managing your own work methods to best suit this division of time, labor, and mental load. You will want to work seamlessly with your team to complete all projects within their designated time limits.
Organization is crucial in managing multiple projects. You will not only want to organize and separate all the materials and resources for each project, but you will want to organize your work day as well. Blocking out time to focus on each project individually is important to help you cover all the projects.
A big factor in your blocking and planning is to make sure you prioritize large, urgent tasks first. If a big deadline is coming up, make sure you provide more time and support on that project. Be sure to also delegate tasks to your team. You cannot do it all, and as a manager of a project, you shouldn't do it all.
Using the resources around you, such as your team, will make it much easier to manage projects. Delegating is crucial, and so is the ability to find the best spot for your team members so they will independently thrive and will not take on the role of a micromanager. You should trust that your team will be able to complete the tasks and roles given.