In your own space, promote at least one canon that you adore (old, new, forever fandom).One, only one, Ha Ha Ha, I laugh in the face of that. Just kidding, if you can only rec one that is great, but I'm going to give quite a few canon recs. I will preface this by saying most of my main canons are things that probably don't need reccing like Game of Thrones, Star Trek, etc, so I'm going to try and rec canons that are a little less popular.
Books: Station Eleven - Multi POV dystopian, that flips back and forth between present day and twenty years in future after the fall of society. It has many dystopian elements, but it is much more hopeful than most books in this genre, and how the author interweaves the characters lives is beautifully done. Bonus, it is being made into a limited run TV series, that is supposed air this year, so if you read it now you will be ahead of the game.
Light Years - Tropey YA Sci-Fi, it doesn't do anything particularly unique or genre defying, but that is not always what you want. It follows four teens at space academy learning to fly spacecrafts. It loved one character in particular, Arran, he is a cinnamon roll of a character, he just wants to make his mother proud, but he is insecure because he comes from poverty and he's never kissed a boy. I just want to wrap him in a warm blanket.
A Song of Ice and Fire - Grim-dark High Fantasy, this one is obviously extremely well known, because it is the basis for the Game of Thrones television series. I will say even if you watched the show give the books a try. There are several minor characters and subplots that are dropped completely or condensed for the TV series, which is understandable, sacrifices have to made many times for adaptations. One subplot I really loved, that never made it to screen, the creepy Lady Stoneheart and the dark Brotherhood without Banners. One warning, the books are absolute tomes, the series is currently over 1 million words, and is unfinished, and it may never be finished.
Graphic Novels:Pumpkinheads - This should be saved for autumn, it really is a love letter to the season, especially from a North American standpoint. Plus, it has the beginnings of a really sweet romance in it.
Also, I just want to rec graphic novels/comics in general. I just discovered them last year and there is such a great variety of stories. If you're worried about where to start may I suggest starting with a TV series you liked as a kid, many have been continued in comic form, like Xena, Star Trek, Batman '66, Wonder Woman '77 etc.
Television: The 100 - I'm going to rec the first 5 seasons of this show, it's dystopian sci-fi, with an diverse ensemble cast, it has it's issues, as you may have heard, but I love the characters so much. Plus it had one of the best adult ships on a teen show ever, they were the perfect antagonists to friends to lovers story. I'm deeply unhappy with where the series went in season 6, so for me the season 5 finale, with a few tweaks, is my head-canon for the end of the show.
Fear the Walking Dead - this is TWD's less loved little cousin, and like The 100 I'm only going to rec the first 3 seasons of this show. It's horror, and features a main group that is mostly family and very dysfunctional, but are kind of stuck together because it is the apocalypse, and bad stuff keeps happening. It also features a main female character who is middle aged, sometimes manipulative, and probably isn't a good parent, which is kind of refreshing to see. In season 4 they did a soft reboot, and it ruined the show for me, so for me Fear ends at the season 3 finale.
X-Men: The Animated Series - the 1990's X-Men, this is the show that made me love the X-men. It has the essential X-Men team, plus cameos from many others throughout the series, and it is one of the only X-Men canons to ever do the Dark Phoenix storyline well, yes that Dark Phoenix, that every other film or series has a terrible time adapting. The animation is not up to today's standards, but was probably considered good for the time.
Supernatural - this one maybe needs no introduction, but I will say if you stopped watching in the early seasons please give the series another go. I may be a loner here, but I really love the later seasons of this show, especially seasons 11 and 13.
Lastly, I made a canon rec post for last year's Sunshine Challenge, you can find it
here