How do you tell if your landing page is working well or not?

For the last month data(Aug 1 - 31), my landing page(https://www.goodnightjournal.com/) shows below states. Is this decent numbers compare to most of landing pages out there as an average?

33.59% Conversion rate, 5:48 Avg. Session Duration, and 1.55% Bounce Rate.

How's your landing page perform?