1. Online Communities: MATLAB Central is an excellent resource for getting help with specific Simulink problems. You can ask questions, share code, and get advice from experienced users.

2. Freelance Platforms: Websites like Upwork, Freelancer, and Fiverr have many MATLAB and Simulink experts. You can post a job detailing your requirements and find someone with the expertise you need.

3. Educational Resources: Websites like Coursera, Udemy, or edX offer courses on MATLAB and Simulink. They might not offer one-on-one services, but they can help you build your expertise.

4. Direct Consulting Services: MathWorks, the creator of MATLAB, also provides direct consulting services. This might be a good option if you're looking for very specialized or complex assistance.

If you have a specific issue or task you need help with in Simulink, feel free to share more details, and I can provide guidance or examples.