SOLVED. YA Fantasy. Siblings venture into a forest that has a barrier with a specific name (the boundary? the layer?) that people disappear into. They run into lots of adventures. Read around 2017-2019.

[katastrophe]

Read it around 2017-2019. YA Fantasy.

They live in a town near a forest and they've heard stories about a boy disappearing in them. There might be a parent missing. They end up going into the forest. OH ITS CALLED THE PERIPHERY BIND

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I REMEMBER THE BOOK NOW NEVERMIND
Wildwood by Colin Meloy

[Rainbowheart]

Glad you found it!

Wildwood for the link.