It's hard to provide specific advice without more information about your experience with other characters or fighting games in general. So, I'll offer some general strategies. Please note these tips are based on my personal experience, having reached the Platinum rank in Street Fighter 6 and previously played Street Fighter 4.
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Master Blocking: This may sound basic, but learning how to reliably block is crucial. Practice against different types of attacks like jump-ins, cross-ups, overheads, and lows.
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Limit Jumping: Avoid excessive jumping, especially as you progress. While jumping may provide easy openings at lower levels, it also exposes you to punishment.
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Refrain from Mashing: Aim for precision in your moves. If your combo is "light punch, light punch, qcf + medium punch", execute exactly that. The initial learning curve might be steep, but your execution will dramatically improve over time.
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Memorize Basic Combos: Learn one or two bread-and-butter (BnB) combos and practice until execution becomes second nature (AKA muscle memory). Remember to practice these combos on both sides of the screen as a warm-up.
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Understand Opponent Habits: Learn to recognize and exploit your opponent's bad habits. Do they throw random Shoryukens? Do they always jump in after you block their Drive Impact? Are they overusing crouch heavy kick? Once you identify these patterns, ensure you:
a. Punish Their Mistakes: Learn how to properly punish their errors. Blocked Shoryu should invite a punishing BnB combo. After a blocked Drive Impact, use a neutral jump kick. If you sense a crouch heavy kick coming, prepare your Drive Impact.
b. Bait Their Mistakes: After identifying their errors and learning to punish them, it's crucial to bait these mistakes by understanding their triggers.
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Diversify Your Approach: Try to vary your strategies and tactics. If you're learning to read your opponent's playstyle, it's likely they are doing the same. So, the game becomes one of unpredictability and pattern disruption.
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Understand Spacing: Fighting games are all about controlling space. Understanding the reach of your attacks, the distance at which your character is most effective, and how to control space to limit your opponent's options can make a big difference.
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Learn the Drive mechanics : Try to make proper uses of Drive rush, drive cancels and drive impacts. These are importants mechanics of the game and knowing how to use them and how to counter them will be important. At lower level, try to consistently punish Drive impacts that tend to be thrown left and right.
Try to maintain your composure while in-game. I tend to get really involved in fights in these kinds of games. Getting tilted is the quickest way to lose. Finding a couple of sparring partners is an effective way to improve and avoid tilt, especially if they are at the same level or slightly better, and they can help you correct your mistakes.
I hope you find these tips useful. I'm sorry I can't help you specifically with Juri.
Let me know if you have some more specific questions.
Anti-airing can be pretty simple. You don't have to use a DP or anything. For instance, Juri easiest anti air seems to be crouching hp (from what i've searched). But maybe it does not seem reliable, which probably is linked to your spacing. If you are staying around silver, working on your fundamentals will do wonder.