(Thanks for replying!)
Isn’t there the Aleutian Islands? If Pacific Northwest seafarers have improved naval technology, there is the chance that they stop at the Aleutian Islands as a way to stock up on food and supplies that they used up. Plus, there is not much of a gap between Kamakatcha and the Aleutian Islands, so it might very well be possible to between the two places. Indeed, with the right winds, a crew of Pacific Northwest Native American sailors might as well visit the Kuril Islands, Sakhalin Island, and maybe even Hokkaido.
The Aleutians wouldn't be very helpful. It's full of hostile people who are extremely well adapted to local conditions, as the waters around the Aleutians are hazardous with abruptly swift currents and very local winds (I should note the winds in general in Alaska normally blow from the southwest, so away from the Aleutians). The islands are treeless, which is very, very bad since trees are essential to every aspect of PNW Indian culture. They don't have any resource the Bering Sea coast doesn't. I mean, sure, there is ivory, but that has limited demand since precolonial Alaska had maybe 75K people at most. Unlike the Micronesians and Polynesians, this would not be expansion into uninhabited islands but expansion into islands with people who use technology better suited for where they live. Is it impossible? No, but it requires a lot more changes than inventing the outrigger canoe, which are useless when repairing them is next to impossible in a place without trees.
It's also a very long distance. The Aleuts abandoned a few of the more remote islands several times and never made it past Attu toward the Commander Islands. In fact, there is no concrete evidence the latter were ever visited before the Russians landed there, although some propose when sea levels were higher they might have been part of a water route.
I played with this in my TL (which goes a lot further in changes to PNW societies than outrigger canoes, although those and catamarans are present), where the Aleutians are a mix of alt-Tlingit and Aleut culture and the islands have a very specialised economy mostly trading ivory in exchange for timber, and said quest for timber drives them to Kamchatka. From the perspective of PNW Indians, Kamchatka is especially interesting because it has a species of salmon not found in Western North America (cherry salmon).
Also, knowing how surprisingly violent the Pacific Northwest tribes were, we would probably see large fleets of Pacific Northwest Native American warriors waging war with each other over trade and fishing routes, which may further spur naval development. Not only that, but wouldn’t metallurgy help? IIRC, the Pacific Northwest tribes actually used metallurgy to forge swords out of iron, albeit it was gained either from Japanese shipwrecks or trade for meteoric iron from the more inland tribes.
They did not forge iron swords or other iron tools, but did know how to reshape them. The big one was copper which they made into sacred plates used in ceremonies, but it was made from native copper which was heated and pounded into sheets (not true metallurgy IMO). Reportedly they were very good at judging the quality of copper from the time of the earliest European journeys. They never used meteorite iron either, although if they did have metallurgy, then the Willamette Meteor once found near Oregon City would be very much sufficient.
If they had metallurgy, then I could see it going to Mesoamerican direction of being primarily decorative/religious, but maybe it wouldn't for some reason or another. The PNW is rich in copper, gold, silver, etc. The copper deposits are often rich in arsenic, producing arsenical bronze. Although to go back to the "long distance seafaring" POD, the US and Canada are poor in easily accessible tin (i.e. cassiterite placers worked in the Old World) outside of the Southwest, southern Appalachia, and Alaska. In Alaska, the Seward Peninsula is among the places with tin placers, so one could imagine a Tlingit trading post in some remote place one day stumbling across a strange silvery ore and creating an even stranger metal, and from there discovering it makes a bronze superior to the arsenical stuff and best of all, can make much more precise alloys (ancient societies could not measure the arsenic content of their bronze making, not to mention few things are worse to breath than arsenic fumes, hence why tin was preferred).
I don't think longer distance sailing would necessarily lead to more wars, especially not in the precontact period where no one has a technological edge.