Oh I forgot that I used Neverwinter 4e! Yes, you're right. After Lost Mine I was homebrewing until 5th level and waiting for Princes to come out, then we dialed the new campaign back down to 3rd and started with new PCs. And speaking of Princes, I don't know why it gets so much hate. I loved it, the players loved it. I did have to tweak some things though to make it more engaging, but I normally do that with campaigns.I'll even extend that further and say for people to pick up 4E's Neverwinter Campaign Setting book as well, if for no other reason that it extends out and fills in a bunch of other locations in and around the Triboar Trail and the Neverwinter Wood. Having all three items gave me so many different locations relatively fleshed out that when I ran this adventure area for my players over the pandemic, they could pretty much go anywhere around the entire area and there were peoples and places to run into.
Those three books combined can give you so much at your fingertips. And that doesn't even cover the actual village of Triboar to the east of the trail which if necessary you can also cover if you pick up Storm King's Thunder.
So yes, grab those three sourcebooks and you will have tons and tons and tons of material. I would definitely use that again if I had new players and wanted to explore the Sword Coast.