Knowing how to get my license back after lifetime suspension in Oregon is not going to be easy. A lifetime suspension of your license - or a revocation of the license- is supposed to be just that... a lifetime suspension. Such an action is not generally taken unless there is a very good reason for doing so. Perhaps you got many DUI's or many serious traffic citations and eventually it was determined that it was too dangerous to allow you to continue to have a drivers license. Whatever the reason, getting a lifetime suspension reversed isn't going to be easy.
The first step to doing so will be to petition whomever suspended/revoked your license. This may mean petitioning the court or the DMV in Oregon. You will generally then need to appear at a hearing before either an administrative judge at the DMV or before a judge in the court who will be deciding your case.
You will need to have a very, very good reason why the license suspension/revocation should be lifted. For example, if you had your license permanently suspended because you had too many DUIs, you could provide clear and convincing proof that you have entered a rehab program, kicked your addiction and been sober for a long time. Whatever the reason, you'll need to prove it and it will need to be good enough to convince the judge that he should reverse the previous decision to suspend your license for life.
If you want to have the best chance of success at getting your lifetime suspension lifted, you should strongly consider enlisting the help of a lawyer.