Product recommendations are off-topic, I'm afraid. We can't tell you what to buy - but we can tell you what to look for so you can make your own mind up.
First you need to look through your existing keepers & see what focal lengths you use the most.
Secondly, decide whether your maximum aperture at that length is good enough to work with, or whether you want more.
Bear in mind, that other than fast aperture, you already have 'every lens between 18mm & 140mm'… so don't rush into duplicating anything in that range unless you're certain you know what you need it for.
One thing I notice from the first page of your pictures is there's no great reliance on a shallow depth of field [the site errors if I try to view more & I only quickly checked them at their initial size on that page, I didn't pixel peep.]
Most are nearly sharp front to back. An obvious outlier is the statue on a table with painting in the background. That one looks like the statue should be the subject, but the picture is in focus. Conflict of interest - and one time a shallower [or perhaps even deeper] depth of field would have clarified your intent.
If you want to experiment with 'shallow' you need a wider aperture lens, or test longer focal lengths, which can kind of do the same thing.
I still consider myself closer to beginner than expert in this field, but what I did, once I'd spent all my money on cheap lenses I eventually realised I didn't actually need, was I got a AF-S 50mm 1.4 G [FX] & a superzoom 18-300mm VR ED DX. I use the long end of that zoom quite a lot, for wildlife. Not so much use for architecture. AT 18mm I'm getting towards landscape/architecture capability, but it's not something I commonly photograph.
The 50mm does portrait well. It's also sharp as a tack where you want it to be & creamy smooth where you don't. The superzoom isn't quite so sharp, of course, but it's very much OK.
I do a lot of macro too. A nifty 50 on some cheap extensions is a great way to get into that without spending on a dedicated lens. I'm not saying the results are the same, but they're a good, cheap second best.
They've become my main two lenses. One to do "everything" which I keep on the camera when I'm going walkabout, & one for portrait or similar distance, & macro with £30 of extensions. Total cost, about £1400 [You could get either now second hand on eBay for £300 - 400.] Sure, I'd love the full set of f1/2.8s, but I can't afford them.
So, first decide what you want to do & what lengths & apertures you need to do that. Find where your existing lenses are lacking at those distances & find a gap that needs filling, not an area that would be duplicating.