My definition of a safe state is any that was decided by a double-digit margin in 2020. And in both directions - blue states that could get redder or red states that could get bluer.
Not to get too off topic but it's amazing that the GOP is even competitive nationally when Dems start off with 210 safe electoral votes. I am not sure I see any of those safe states becoming competitive without a realignment.
For Oregon to be competitive the GOP would have to do way better among urban and suburban voters than it currently does.
For New Mexico, they'd have to improve drastically among hispanics.
I don't see either of those things happening in 10-20 years without the coalitions majorly changing.