Good advice about replacing with quality stylus. If you want a new p-mount cart which hasn’t been mentioned is the Grado which is available in p-mount. Play it awhile then upgrade the stylus to an 8MZ or higher. I did this for my daughters p-mount Technics belt drive and it plays a treat with her antique NAD and Mirage bookshelves. Just another thought. YMMV
Let me offer a big +1 on this recommendation. I have a slightly earlier Technics deck than the OP's 'table -- an SL-230 from the late 1970s with the 1/2" cartridge mount -- with a Van Alstine Longhorn Grado Green in the headshell. The sonic improvement I heard when I upgraded the stylus to an 8MZ was not subtle.