Bellow Sr, Abraham Bellow, who died in 1955, always described Saul as a desperate sluggard, the only son ‘not working only writing’. Not working? From Augie March:

All the while you thought you were going around idle terribly hard work was taking place. Hard, hard work, excavation and digging, mining, moling through tunnels, heaving, pushing, moving rock, working, working, working, working, working, panting, hauling, hoisting. And none of this work is seen from the outside. It’s internally done…[I]n yourself you labor, you wage and combat, settle scores, remember insults, fight, reply, deny, blab, denounce, triumph, outwit, overcome, vindicate, cry, persist, absolve, die and rise again yourself! Where is everybody? Inside your breast and skin, the entire cast.

‘It’s the same idea, isn’t it,’ I said to Rosamund. ‘The hidden work of uneventful days.’

until recently I was retching and whimpering away with some brio

The end of a sentence is a weighty occasion. The end of a paragraph is even weightier (as a general guide, aim to put its best sentence last). The end of a chapter is seismic but also more pliant (either put its best paragraph last, or follow your inclination to adjourn with a light touch of the gavel). The end of a novel, you’ll be relieved to learn, is usually straightforward, because by then everything has been decided, and with any luck your closing words will feel preordained.

Don’t let your sentences peter out with an apologetic mumble, a trickle of dross like ‘in the circumstances’ or ‘at least for the time being’ or ‘in its own way’. Most sentences have a burden, something to impart or get across: put that bit last. The end of a sentence is weighty, and that means that it should tend to round itself off with a stress. So don’t end a sentence with an –ly adverb. The –ly adverb, like the apologetic mumble, can be tucked in earlier on. ‘This she could effortlessly achieve’ is smoother and more self-contained than ‘This she could achieve effortlessly’.