Changing PhD after 8 months
I would look for new positions at your university. There's no need to sound the alarm. It's pretty common for students to rotate around different labs during the first year and then make a decision at the beginning of the second. Where I did mine, they had a soft requirement that you had to do a rotation in at least 2 labs before you were allowed to decide.

Getting involved with the right project is (arguably) the single most important decision you can make to set yourself up for a successful PhD. If it takes you an extra 6-8 months to find the right project for you, then that is absolutely worthwhile. I had a friend change labs after 2 full years of working on a project. I thought he was crazy but he was able to find a different project in another lab and received his degree, just the same as the rest of us.