I'm sorry to poke at you, but... I've been completely unable to delve properly this league due to a bug that prevents loading into the mine with certain nodes. There are multiple reports on the forums (including mine) but the problem is not even in the known issues list yet. I get that it's probably not getting attention due to being a widespread issue but it still sucks.
https://www.pathofexile.com/forum/view-thread/2706450
Edit for some extra info:
Some nodes that disallow teleporting to them can be walked to from others. This has let me do a few delves that seemed impossible at first.
However, some nodes attempt to refresh the instance when you try to start a Delve from them - obviously because the area of the instance I entered from another node is limited. Similarily, you can't walk around endlessly in Delve due to the same area limitations. This means that just walking to the broken nodes is not a solution