I do (and have) spent most my life drawing, writing has always been a secondary thing... Which is quite frustrating because I tend to think my writing is better writing than my drawings are drawing, if that makes sense.
As for your questions:
How do I manage both? I don't manage them. I can go weeks without writing, I don't typically go weeks without drawing though. They're both hobbies so I just do them as I see fit. I will admit, though, writing does feel like more of a chore.
Drawing influences my writing a lot. I need to doodle the characters and some scenes to really get the juices flowing for novel plotting. And, in turn, sometimes scenes I write inspire some artwork. But I do not need writing to make my artwork.
In my day to day life I lean on drawing more. I've always enjoyed it more and find I can do it while listening to podcasts or music while writing I need quiet.
I have combined them, I do comics. The issue with that is my art style doesn't feed into my writing style well at all. Besides, dialogue is never a big part of my writing which is basically the only writing involved within the comic itself.
Backgrounds are something I lack at soooo bad, so it's far easier for my to paint an environment with words opposed to comics.
Like this:

is way better than anything I do for my comic (different locations but I think this makes my point);

And the subject matter of what I write and draw are very different in general. My comics are a real mixed bag. Some of light, some are heavy, some a decent mix. My darker comics just don't look right, imo, but that's just the type of stories I feel most comfortable writing so I have done a few ('Tales of an Executioner' on Webtoons, "Robotic Twins: Hansel and Gretel" on Webtoon and Tapas). But I've also done a heartwarming romance (I hated it, it was my most popular though. My drawing style lent well to it.), and a lighthearted fantasy story ('Rune's Grand Adventure' on Tapas and Webtoons). The other ones ('The Lies of a Heartbreaker' and my current comic 'The Alp's Assassin' both on Webtoons and Tapas) are the mixed ones. Super serious plots and moments with a lot of levity to soften how jarring my artwork and stories are clash.
Where as my writing is always pretty moody and serious, even in the swashbuckler I'm doing. A lot of the (panned) scenes are pretty dark because that's what my writing style lends to best. I'd give an example, but all my best written darker scenes are huge spoilers (I mean, the snippet I posted also is from a chapter that hasn't been released yet but it doesn't contain spoilers sooo). The only one I can think of that is current out is all about a dude planning on SA'ing the leading lady which is a bit heavy to just throw wildly into the forums for all to see at random (I know you've read it though, if the one reading this comment is the topic's creator).
But needless to say, that stuff does NOT suit this adorable ass drawing style, no matter how many times I try to force it with my stupid horror comics, so adding any visuals to my novels would likely do more harm than good:

So, the only artwork I attach to the novels themselves (within the works, I'll still post doodles of the characters and whatever elsewhere) are the title pages. And, if I'm being frank, I hate doing that. I'm just too proud and poor to get them elsewhere.


This has been a total ramble, I apologize. I'm not even sure if any of it made sense. I know I said I feel I'm a better writer than artist, but like, streams of contentiousnesses are like, soooo different! 