Umm - Howard was 30, not 35 (1906-1936)
I think that he'd have continued with Conan while the demand was there, but in the last couple of years before his death, he mainly wrote Westerns. Given the range of the genres he tried, fantasy, boxing, treasure-hunters, straight westerns, weird westerns, etc, who knows? He even wrote what we'd call romance stories (for Spicy Adventures) which were regarded as marginally pornographic at the time...
Side note: I found an Aussie website that has a lot of Howard’s short stories for free reading. Conan, Kull, Bran Mak Morn, Solomon Kane, weird detectives, weird westerns, straight detectives, straight westerns and comedy westerns. I really enjoyed the past couple of weeks reading them, especially the Breckinridge Elkins stories.
Lovecraft's death would have shaken him up, surely.
I could see Howard writing more weird stories with local color -- Southwest locations -- and maybe trying to write a serious historical novel with a Southwestern locale.
Didn't he say he felt as if Conan was standing over his shoulder while he wrote and one day he just walked away?
He probably was more concerned about "the sons of bitches" hiding in the bushes that he took out his guns to be ready for.
I suppose (like many professional writers) he would have to put aside what he wanted to write and go with what would pay. He certainly seems to have been adept at writing in different genres.
Would he get mainstream publishing attention? Raymond Chandler, Hemingway etc. were dominating US literary focus of the time--and their characters were so different from his. He wrote about fighters and physical combat and adversity. There's little introspection in his characters I am familiar with which it seems was something publishers sought. Sam Spade and Marlowe did not fight their way out of a problem. Unless he found a niche like WW 2 fiction--I could see him attaining some notoriety there--assuming he politically aligned with it. I know what Lovecraft would say to him about his chances to gain literary attention.I think it possible that he would have become a major voice American literature in general .
I think Howard would have switched to writing scripts for films. He was writing to get paid and given the upcoming rise of western films I think he would have leaned towards that. He might have returned to Conan at some point if the inspiration took him.
Would he get mainstream publishing attention? Raymond Chandler, Hemingway etc. were dominating US literary focus of the time--and their characters were so different from his. He wrote about fighters and physical combat and adversity. There's little introspection in his characters I am familiar with which it seems was something publishers sought. Sam Spade and Marlowe did not fight their way out of a problem. Unless he found a niche like WW 2 fiction--I could see him attaining some notoriety there--assuming he politically aligned with it. I know what Lovecraft would say to him about his chances to gain literary attention.
Here's a thought-if he had gained wider literary attention and higher paid work--would he have committed suicide?
He sounded paranoid or at least very eccentric/theatrical from the remembrances of the writer who visited him--imagine him showing up at a publisher with guns on his person.