I think Bloom Into You is good. However, you'll need to switch to the manga halfway through since the anime is incomplete (and will probably never be finished).

Plastic Memories is a personal favourite.

• It's a work/office setting, so "grown up"
• It explores some sci-fi, human condition themes and as the name suggests, about "memories" which funny you should mention about nostalgia etc.
• I thought it was a real tearjerker (or maybe I'm a softie)
• It's released 2015, so you might find it dated?

Oregairu could be something you could like. While it's setting is typical, it is much more atypical in how it deals with the romance.

You might like Servant x Service, it's not explicitly a romance anime, more of a comedy but it has some romance sprinkled in from what I remember. It focuses on a a few employees working for the local government at a DMV style office where they deal with customers all day. Light hearted and definitely relatable if you've ever worked a service job.

Golden Time was pretty good when I saw it 12 years ago. It's a college setting so a lot of high school tropes are gone and the characters act more like young adults. I wouldn't say you need to watch it, but it's not bad.

Ore Monogatari or "My Love Story" is a favorite for me and my partner. It is a high school setting, but the characters and the pacing make it worth it. If you give it a shot just make it to episode 3 before writing it off.

You probably wouldn't like Toradora but it's highly regarded. High school setting again with a lot of clichés, but the clichés are used really well, and make up for the fact that you've probably already seen the stereotypes play out before.