Is there a way to undo the oreo update?

I have a galaxy s7 and I'm not at all happy about the new oreo update. I want to go back to what it was before this, because I haven't seen ANY benefits from this new update and only problems. My battery tanks considerably faster now, my selfie camera looks OK until I look at the actual picture and it's horrible by comparison, I can no longer assign different text alert sounds to separate contacts (which is really important when you can't be looking at your screen every time a text comes through), and my phone has been laggy all day since the update last night.  I hate this version and I have yet to discover any actual improvements