Is it compulsory to visit the reporting centre after my allotment of 7th round in JoSSA?

Yes, you need to visit the reporting center, if you have got the seat in the 7th round of the JOSSA for the further admission procedure.

If you have been already allotted a seat through JoSSA, then you need not to visit the allotment center again, you need to visit the allotted colleges for further process.