Hey Alex, the serves you spoke about there are good combinations for sure. I would say the key thing with serving is variation so the opponents don’t get used to where the ball is coming, what spin and everything like that. I think in the modern game long fast serves can be very effective mixed in with good short backspin serves. For sure if you can get a solid tomahawk serve with side/backspin and then side/topspin a lot of players find that very difficult to read and deal with.
Also serves short in to players forehand can be effective as it can make players lean in and reach for the ball with a weak return and then you can attack quickly into the body. Last one I want to mention is thinking about short side topspin or float serves mixed with heavy backspin can often cause outright mistakes or a high return allowing you to again get in the first attack. But variety is the key and being unpredictable!
