Forgive me, for I'm 65yo.
However, you might be interested in my reply.
Stress relief, in the most part, is similar in all ages.
Proper relaxation techniques has been proven to be effective. Muscle tensioning exercises, yoga etc.
Young adults have specific challenges that create stress, financial hardship, job interviews, HECS fees, careers change, relationships, the list goes on. Some of those problems can be overcome in various ways like toxic relationships overcome by acknowledging them for what they are and moving on, career change is feared for it's radical movement but is very understandable to not be decisive at young ages etc.
I hope you get young adults to respond as you've raised an interesting topic.
Beyondblue topic worry worry worry