Colourless Tsukuru and His Years of Pilgrimage is a book by Murukami and features a lonely main character

Yeah that was my point, hope it came across like that

Becky Chambers (Long Way to a Small, Angry Planet) wrote a sci fi series she self published and from what I recall of my read through is that it has female centred storylines, an appreciation of diversity, no damsel in distress tropes and it avoids the DV angle. Her characters aren't "damaged" but they are human/humane and have their own histories.

I'm not a huge fan of the sci fi in that book, but I'm not unhappy with it. I think it's more an opening to a bigger story.

Either way, try it out. Her fans may show you a gateway to other similar stories.

She definitely seems like one of the more positive story authors I've come across and that in itself is valuable.

Oh and William Gibson.

Sprawl Trilogy in particular.

David Brin. Stephen Baxter. Robert Forward. Greg Bear. Stanislaw Lem. Kim Stanley Robinson.

I equally recommend any and all of these.

Or if you want even more strange, his novel Embassytown is a genuinely unique take on typical sci fi in space.