Can I repeat high symmetry points manually by copying the sequence on input file?
High Symmetry points for a particular system can be found in the literature and online sources. Such as, the work entitle Band structure diagram paths based on crystallography. Also, you can check online tools like SeeK-path.
Performing calculations by this, you will understand which path suits your structure best and you will know to increase the number of points as well as eigenvalues that need to be computed in a path.