Cheap Apollo forks: The fork suspension feels too soft
Cheap suspension forks just use a big undamped metal spring in each fork leg.  If you can disassemble for the forks and don't mind making some irreversible modifications, you can increase the sprint rate at the expense of travel by cutting and shortening the springs. You would need to add spacers of the same length as the reduction in spring length. Sections of appropriate diameter thick wooden dowel would do.