Hmmm, I'm not sure what's happening with the inn. If he's still there then you should be able to just complete his quest line again.
And more options could be added to the restaurant, although it'd require somebody to write them. Although as you said, you're basically well past the point that a lot of other players would consider "impossible" to get to. There's a couple repeatable quests at the restaurant and smithy in town. Although those are pretty minor and just exist as a way to get gold.
Same thing with adding more quests to the "end game". Somebody would have to write them. And even then that just pushes what constitutes the "end game" back a few more minutes. There's still a few things I have lined up previously I could add. Although it might be a while until I get to them.
In any case, thank you very much for the feedback! I don't really have any donation links set up or anything, but just knowing you enjoy the game is support enough for me :D