Hmm... See, this is a tricky question because I don't think that anything post-Buu arc is truly
essential. There's ups, downs, stuff I really like personally, but none of it is an Andor situation where it's so masterfully written and enriching to the original story's themes that you just have to check it out. If you feel satisfied with what you've read so far, you can stop. If you are really hungry for more from this universe, I will highlight the big picture pros and cons of the current 4 major post-Buu timeline splits:
GT
+Only one that actually fully moves past the original manga's ending, the others are weird midquel type things. Has Super Saiyan 4 and some really interesting arc villains, also features the super intriguing Hero's Legacy special which is about Goku's descendent from 100 years later
-Story starts with Goku being magically turned into a child again, next-generation cast is built up at the beginning but fizzles out in favor of Goku spam, mediocre production values
Super Anime
+Very high highs, imo way more cool character and form additions than GT (Beerus, Goku Black, Hit, Ultra Instinct, etc.)
-Notoriously rocky production (Resurrection 'F' anime version is so ugly to the point you're better off just watching the movie), overreliance on Goku and Vegeta pre-ToP with some iffy characterization, overall suffers a bit from Hype Moments and Aura syndrome
Super Manga
+More consistent and in-line with Toriyama's vision than its anime counterpart with additional arcs, including the very good Moro arc which'll be animated next year
-Literally not a complete product, Battle of Gods is comically rushed and Resurrection 'F' and DBS Broly are flat-out skipped over and relegated to dialogue dumps
?Goku Black arc and Tournament of Power are very different from their anime versions despite following the same basic story skeleton - your mileage may vary
Daima
+Absolutely beautiful, whole series spent on very fun worldbuilding on a whole new setting in the Demon Realm
-Goku turned into a kid
again, this time with all his buddies joining in, entire last act is contingent on an especially egregious and poorly set-up bit of fanservice
?Very short, just 20 episodes
Also as Local Dog said, please consider checking out Toriyama's other mangas. Of special note is Galactic Patrolman Jaco, which is set in the world of Dragon Ball and whose title character appears in multiple Super arcs