Most common moves for a certain rating

I'm entering into a tournament in about a month, and any time I tried to learn openings it's gone quite well but I noticed that a lot of the moves I'm told to expect are completely unrealistic from someone of my level. My plan to get around this is to create "my own openings" where I look at most common responses from people of my level and find the engine response and learn that. Is there any way I'm able to find the most common moves from a certain rating range?

You could play a lot of games to find out how people near your rating respond to move.

But to prepare for all sorts of ratings is kind of... impossible... because there are so many types of players and openings people choose.

Anyway, one opening that comes to mind is the Scotch which is 3.d4

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Black has various ways to play, almost always starting with capturing once on d4... but most lower rated players will capture twice, which is a mistake.

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I mean, one little example line isn't going to make you an expert or anything... mostly I wanted to say the Scotch came to mind at something inexperienced players will often misplay and give you a nice advantage as white.

I like to use Lichess's opening explorer because it shows what other players are playing. At your level. By looking at the first four moves, in the chess.com opening explorer, you are very weak against the Italian Game. I would want to study that by either getting a book like the 1...e5 book from Quality Chess or find a Chessable Course on whatever you play. For you, you seem to like play e4 as White (Scotch Game) and play 1...e5 against e4 and 1...d5 against d4. 

For 1...e5, try this Short & Sweet: Nguyan and Jarmula 1.e4 e5 course and/or the Short & Sweet: Simon Williams 1.e4 e5. I personally like the Semi-Slav course by Sam Shankland but by the look of it you face the London more often than a Queen's Gambit and if they do play Queen's Gambit, you do ok with the Albin for now. Here is a pgn from Sam Shankland's Semi-Slav course against the London. This is by far my favorite way of play 1...d5 against the London