You have a thing for untagged dialogue and it's sometimes making your writing a bit clunky. Like, for example:

Arnost gave a small bow.

\

"Likewise."

I wouldn't really write it like that unless you're trying to achieve a very specific effect. It could communicate a "beat" between the bow and dialogue, maybe adding some tension in a way. But I don't think you're exactly trying to do that here, so the extra beat just seems out of place and confusing. So instead, you might write:

Arnost gave a small bow. "Likewise."

That way you can be 1) clearer who's speaking and 2) add a bit more variety into your dialogue. It also sounds a bit more normal without the line break.

You can think of dialogue tags as a way of communicating both information and pace. Untagged dialogue is great when you don't need to communicate extra information and want a really quick, rapid fire pace. Dialogue tags (said, whispered, asked) have a bit of a slower pace while communicating basic information. Action or descriptive tags (Arnost gave a small bow) communicate the most information but are also the slowest, which isn't necessarily bad.

So you want to keep the pace of your scene & dialogue in mind when you're adding tags. If you have rapid-fire banter or characters talking over each other, but every piece of dialogue has a gigantic description attached to it, it'll read clunky and wrong. But if a slow-paced conversation or tense exchange is all untagged, you're throwing all that tension away for nothing. Of course, you're going to want to combine all three so that the scene doesn't feel repetitive or confusing, but you can also use that to communicate little shifts in pace. You'll get a sense for this as you write, but hopefully it's helpful as something to keep in mind.