I don't provide this service but i have knowledge about autocad. Autocad is a good option for providing services like doing redesign 2d designs, mechanical designs, electrical designs and much more
For making a best portfolio you can follow the follwing steps:
1. Add tons of projects done by you and those projects should be the best and the most recent projects of yours.
2. Add relevant social accounts
3. Add relevant content about yourself that what you do or who you are
4. Add your skill sets in which you are experts
5. Add your resume to your portfolio
6. Use professional images of yours in your portfolio
I think this above steps helps you to build a professional portfolio