If JHB tries a comeback, MGP is presumably DOA but otherwise, so long as she maintains Peltola-like vibes that win her JHB swing-voters, she'll be fine.
Peltola's situation in Alaska is a poor point of comparison to WA-03. Alaska has always been one of the more unusual states politically, given its isolation, history of coalition governments, and comparatively strong support for non-major parties that make it far different than most other places in the mainland US. I also think Peltola's performance in November was far more impressive. With Alaska's modest Democratic trend over the past decade, she could be positioned well for a long career where she can enjoy significant crossover support. WA-03, by contrast, contains more archetypal working-class Trump voters who have shifted away from the Democratic Party, and the region has become more Republican since the Obama era. Gluesenkamp Perez only won by less than a point, which isn't far off from the district's partisanship, against a flawed opponent. Not saying that she can't win reelection, but I'd still think a more serious Republican candidate (really someone who isn't Kent) would have a good shot at taking her down.