Good morning, @Fantastic! You can replace the nib of your S Pen, I recommend taking a look at this S Pen support page here, there's a section titled 'Replacing the S Pen nib'.
@Fantastic @AshP_ It says parts discontinued on the Samsung link though. it would be more cost effective to replace the nibs and they seem have compatible ones at Amazon https://www.amazon.co.uk/S Pen Nibs
I do not work for Samsung or make Samsung Products but provide independent advice and valuable contributions.
My Device- S21 Ultra 5G ( SM-998B/DS ) CSC= BTU , 12GB/256GB
One Ui 5.0,Android 13 .