Same here, using an iPad Pro w/ Apple Pencil.
There are a few threads about this, but the tldr I'm reading is that sketching is just completely broken on mobile / iOS, as no one has been able to come up with an answer or way to make it not utter garbage.
It'd be pretty awesome if a dev would chime in about this tbh, some of the threads I'm seeing are months old at this point.
https://discussion.evernote.com/forums/topic/130739-heavy-sketch-issues-on-ipad-pro-with-apple-pencil-2/
https://discussion.evernote.com/forums/topic/128190-sketch-and-apple-pencil-issues-missing-strokespencil-input/
https://discussion.evernote.com/forums/topic/128220-problems-with-sketch-notes/
Honestly the new Evernote, on mobile and PC, is hot garbage. They should have never released this (and I feel like, as someone who has been making software professionally for almost 10 years, I'm in a good position to judge). I would have not purchased Evernote in this form, not a chance. It's UI is nicer but the application itself is just far worse.