Try and write straight English; never using slang except in dialogue and then only when unavoidable. Because all slang goes sour in a short time. I only use swear words, for example, that have lasted at least a thousand years for fear of getting stuff that will be simply timely and then go sour.
Not getting bored of my own story and/or character is one of the main struggles I have had with novel writing, and I have put to bed big chunks of work that just didn't sustain my interest.
Why does one write these books after all? The drudgery, the misery, the grind, are forgotten everytime; and one launches another, and it seems sheer joy and buoyancy.
I suppose every one must have reflected how primeval and how poetical are the things that one carries in one's pocket; the pocket-knife, for instance, the type of all human tools, the infant of the sword. Once I planned to write a book of poems entirely about things in my pockets. But I found it would be too long; and the age of the great epics is past.
They are always asking a writer why he does not write like somebody else, or a painter why he does not paint like somebody else, quite oblivious of the fact that if either of them did anything of the kind he would cease to be an artist.