Perhaps we're using "blue wave" differently. To me, a "blue wave" would be Biden scraping a win on election night and then solidifying it into a 338+ blowout, not "Trump wins on election night and then loses as mail-in votes are counted". Having a 50-50 Senate at best isn't exactly a "blue wave" either. (Which is what happens if the Republicans win NC and AK, but lose both the Georgia Senate seat runoffs)