Hi there. One piece of advice I have is to start by creating a detailed outline of your dissertation. This can help you organize your thoughts and ideas and ensure that your work is structured and flows logically. It also helps to break the project down into smaller, more manageable tasks and set achievable goals for yourself along the way. Also, pay enough attention to the research paper proposal. This is a very important aspect on which the whole work essentially depends. If necessary, contact a specialist for help with this(https://www.phdresearchproposal.org/).
Reach out to your advisor or committee members for guidance and support. They have been through this process before and can provide valuable insights. Additionally, consider forming or joining a writing group with fellow students. Having a community of peers who are going through the same struggles can make a huge difference.