What might this be? Well, if something is uplifting - it raises us up to regard it. Generally, in my world, we look to create art, events, spaces that have a sense of upliftedness about them. If I'm having people over for dinner I make sure the entry way is clean and shiny - that I've put some extra care into the food and its presentation, that people will be comfortable and generally happy in our home. That doesn't mean we won't have challenging and stimulating conversations - we will. We will argue politics and religion and almost anything with verve and passion. But we won't let things slide into decrepitude - into surly diatribes or mean-mouthed rants.
How does that relate to revision? I think it means that in the revision process we do remember that we are offering this manuscript up and that we want to make it hospitable. That means that we neither talk down to our reader or try and mystify them with convoluted 'artsy' ways. We want our readers to look around and think - wow, this is interesting! I think I'll like the level of conversation here.
My fella and I like to watch comedians and we are quite fussy. It takes us moments to go 'uh no. He hates women (a surprising number of male comedians seem to fall in this category) or this guy or gal isn't funny - just mean. I think what we surmise is that they aren't uplifting. The ones we really like make us feel better for watching them - not worse. That isn't to say they have to have a Pollyanna view of the world - au contraire! But if it is nothing but shallow cleverness or mean rants ...well we don't want it.
When you take a hawk's eye view of your manuscript make sure that if it is clever it also has substance. Make sure that your reader won't feel undervalued or mocked. Challenge your reader but don't bait them. Let them know what you want them to know without either hitting them over the head with it or making it like some convoluted treasure hunt of meaning.
Here's a drawing I did of an osprey - now that's uplifting!