Carmella and R-Truth (from SmackDown Live to Monday Night Raw)

Carmella has been a part of SmackDown Live since she was called up from NXT back in the 2016 draft. She has accomplished everything that she could have accomplished as she won the WrestleMania Women's Battle Royal, won the inaugural Women's Money in the Bank match, is a former SmackDown Women's Champion, and won the Mixed Match Challenge alongside R-Truth.
R-Truth is also unlikely to accomplish any more on SmackDown Live so the two should go over to Raw. R-Truth can have good matches with superstars like Seth Rollins while Carmella can face off with women like Bayley (Baymella reunion?), Sasha Banks, and Nikki Cross.
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The Usos (from SmackDown Live to Monday Night Raw)

The Usos have been the top team of SmackDown Live for the past few years. Now that they have lost the SmackDown Tag Team Titles to the Hardy Boys, it is time that they shake things up and move to Monday Night where they can help a tag team division that badly needs it.
If Naomi will be moving to Monday Night Raw, it is only fair that the Usos go there as well given the fact that Jimmy Uso and Naomi are married. The Usos can have great tag team matches with Bobby Roode & Chad Gable, AOP, and Curt Hawkins & Zack Ryder.