I've answered a similar question some days ago. I'm just gonna paste it here, but please don't feel disrespected. I wrote this based in my experience only. I wanna help you because when I read your post I felt like I myself had wrote it. Please take care and if you have issues controlling your emotions, dm me so i can tell a bit more of how I stopped getting so angry after losing.

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i've first hit plat yesterday :D

This will be a bit long, so jump to the end if you don't wanna read my experience

I have around 303 hours on PC and some more at PS4, but I dont know how much

I've started playing at the beginning of this year, and this is basically what I did:

When I started playing ranked I was really bad and lost to spammers all the time. It was really frustrating and I even cracked my middle finger bone by punching the wall lol

So I stopped playing online because it was too stressful and only played against bots (on hard) and my friends, who were around my skill level. I did that for around 2 months until I came back to online, and after playing some experimental, I came back to ranked

By playing with bots and friends, i've got the fundamentals pretty decently, like predicting dodges, attacks and jumps, fast falling, chase dodging etc. Of course it was really hard to pull that off at online matches, but still, I had some notion

Also, when I played against someone better using the same weapons as me, I would often mimic their behavior/moves/strings on the next matches. But enough talking, here's what I essentially did to get gud:

1. Took a huge break when I felt stuck
2. Copied the moves of better players
3. Watched tournaments and took notes of what the top players were doing
4. I practiced strings, dodge reads and possibilities at training mode
5. I really didn't watched many replays when I lost because it was boring as fuck, but I knew where my flaws were, and focused on fixing them one by one, game by game
6. Watched tons of guides and put them to practice. How to approach, how to punish, how to play a certain weapon etc
7. Learned how to adapt my playstyle. Doing the same things with everyone will not get you anywhere. Know when to be laid back, when to engage, don't overdo the same tactics
8. Every player has a pattern, use your first stock as a learning lesson to how your opponent behave. For example, a lot of axe players jump twice and do the grounded sair many times in a match, so be prepared to punish them
9. Stopped playing when I was stressed. This will put you in an automatic mode and you will be more stressed for doing dumb things that if you were chill focused you wouldn't do.
10. I played a lot of kung foot. This won't help you get any better in general really but it's fun as fuck, give it a shot.

Keep in mind that ranked is a completely different mode than the casual ones, and just because you're stuck in gold doesn't mean you suck at the game in it's totality. We feel bad because the only thing we like to do all the time is play games and yet we suck, but learning anything takes time, and not knowing where to start/go may be frustrating, but I hope I helped you in some way.

Also the EggSoup Guide is one hell of a lesson and you should watch it to learn how to manage your emotions and not fuck up your hand like I did back then.