There is a wide proliferation of journals, both print and online, but a tendency towards the shorter: poems of a page or less, sometimes with a maximum line count explicitly stated in the submission guidelines.
Especially in the age of social media, there is more attention towards shorter and aphoristic poems, poems that start and end neatly and can be easily shared. There aren't nearly enough venues publishing long poems.
+doc is a biannual journal focused on longer poems and poem sequences, including visual poetry.
Submissions are now open for issues 3 and 4 (July 2022, January 2023). To submit, email email@example.com (subject: "+doc submission") with the attached poem(s).
+doc.1 (Summer 2021) — melanie brannagan frederiksen, rob mclennan, Tom Snarsky.
+doc.2 (Winter 2022) — Amanda Earl, Grant Wilkins.