Re-domestication of LLC
Unfortunately the state of Washington does not allow companies to re-domesticate there. Like most other states, Washington requires you to start a new company there.
Another option would be for you to create a foreign entity in Washington, which would allow a company to work as a subsidiary for the main company. This way you can retain the company's age and history, but, on the downside, you would need to maintain both the NV entity and the WA foreign entity.