Tips to hit higher elo and accuracy? Other than just 'practice and repetition'?

Looking for any opening/rules that I should familiarise myself to become an intermediate player 

My number 1 tip for you personally is to stop playing blitz and focus on rapid. And when playing rapid, you need to use your time. I looked at a bunch of your rapid games and most of them you only use a few minutes of your clock. This is not how to improve at chess. In a 10 minute game, you should be spending at least 3 minutes in first 10-15 moves. Avoid snap decisions where you make a move after a few seconds of thinking. It's in those situations that you will blunder or miss an opportunity.

There are no simple tricks to becoming an intermediate player. Use your time, study every game you play and determine what went right and what went wrong. It just takes work.

Wow that's actually awesome advice, thank you very much! Also another thing- I watched a couple of your videos and I'm guilty of only playing the center game opening, any particular opening I should try learning instead? 
On a completely side note, I loved your videos for their easy to understand and informative content! Keep up the great work : )

Thank you! Always love hearing feedback! There's a lot of debate on whether novice players should focus too heavily on an opening repertoire. I'd definitely stick to one opening as white and maybe two as black (depending on if your opponent plays 1.d4 or 1.e4). If you want something really solid, learning the london system and caro kann are good options. If you want something more dynamic and tactical, I'd recommend scotch game and sicilian defense.

Improving Your Chess - Resources for Beginners and Beyond.....

https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond

Good Chess Books for Beginners and Beyond...

https://www.chess.com/blog/RussBell/good-chess-books-for-beginners-and-beyond

I agree with you on 3 out of the 4 of them, but to low rated players: please please please please please please please please please please please please please please DO NOT LEARN THE SICILIAN, it is 100% a waste of time, I’d recommend the London or the Colle, just a system to guide your openings.

Simple answer, try the Stonewall. You will reach 1000 in 2 days!

The Stonewall Attack...

https://www.chess.com/blog/RussBell/stonewall-attack

"Learn a new opening" is a noob trap. A distressing number of players try to use rote memorization as a way to avoid actually learning how to play chess.

There are several problems with that approach, but one of the most serious drawbacks is that the games you lose can't TEACH you anything, except perhaps that you memorized the wrong line or didn't memorize enough side-line alternatives.

1) Every game that you lose should TEACH you something, and this forms the first item of my advice. Play over each one of your losses, and try to figure out why you lost each game. And I don't just mean "I blundered away my Queen"... I mean: WHY did you blunder away your Queen?

Ran out of time and just started making random moves? Then work on your time management. You just didn't feel comfortable in that type of position? Too open? Too closed? Too random and tactical? Too symmetrical and boring? Then either learn how to play that type of position, or learn how to AVOID it. Your own lost games are a gold mine of information on what aspects of your game require improvement.

2) Don't put too much stress on learning openings or memorizing lines. People do that as a way to AVOID thinking. Avoiding thinking is not all that good for your chess. Your only important task in the opening is to reach a middle-game position in which you feel comfortable and confident. Everything else is personal taste, or even fashion. Chess players are as fashion-conscious as teenage girls.

3) Instead, spend more time learning tactics, and study model mates (checkmate patterns). I can give examples on request.

Be aware that chess has a certain internal logic, and that an attack can only succeed if (a) you already hold the advantage, or (b) the opponent defends poorly. An attack that is launched from an equal or inferior position SHOULD be repelled and refuted. First you must gain the advantage by out-maneuvering your opponent, and only THEN can you attack with confidence.