What's a good opening repertoire for me to study (1350-1400 Rapid)?

I still blunder all the time (and I know that's the biggest thing I've got to fix to advance to the next level), but I also don't have a consistent repertoire of any kind.

I spend way too much time evaluating opening positions, when I know I should just be bashing out moves automatically for common openings. 

Can anyone recommend some good openings for my level? 

Modern Attack/Defense vs almost everything.

a3+d3+g3+Nf3+Bg2+O-O (for white)

a6+d6+g6+Nf6+Bg7+O-O (for black)

Thank you! I do like fianchetto type setups, and these do seem solid without immediately losing, but I'd prefer something where I could gain more of an advantage, especially as white?

Well, you can check the latest trends of top-GM games :

https://www.chess.com/forum/view/chess-openings/fide-candidates-tournament-2021-english-opening

https://www.chess.com/forum/view/chess-openings/fide-candidates-tournament-2021-french-defense

https://www.chess.com/forum/view/chess-openings/fide-candidates-tournament-2021-grunfeld-defense

https://www.chess.com/forum/view/chess-openings/fide-candidates-tournament-2021-ruy-lopez

https://www.chess.com/forum/view/chess-openings/fide-candidates-tournament-2021-sicilian-defense

reti's opening is great cuz its flexible and you choose what type of position you play

Start with the Modern and transpose to the English

Study the italian game it's the best opening ever.

Both the Reti and English look solid, but seem intimidating because they seem so open-ended (especially Reti) - it feels like they could develop in so many different directions, and that would require me to be comfortable in many different positions?

I do play the Italian game a lot. I wish I could play the Evans Gambit every time because it's so fun, but people usually end up playing Nf6 instead of Bc5.

I like to play Vienna for white