Try turning on the activity auto-linking filter (Site Admin > Plugins > Filters > Activity names auto-linking). Even if you don't link to activities by name, when I (Fordson, Moodle 3.9.1) hover over an activity, I get a link to it such as https://example.edu/moodle/mod/quiz/view.php?id=142 that I can use anywhere.
Accessibility and usability
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