I Improved a lot when I just stuck to one character for a while so maybe give that a try. Remember that pretty much everything has a counter to it. If your grabs are getting ducked, then next time you run up close to grab, go mid instead(just this alone will beat 90% of people online). From there I'd reccomend learning how to win matchups you struggle with and read DrakeAldan's articles if you haven't already.
whoops kept making typos so I deleted/readded the post. Judging from those extra comments you put in while I was typing my post, I'd say the stick to one character for a bit would probably help you a lot.
when you're friends with people like wolflonethe andyrooxds and phuriate, I tend to lose a ton, I'm good, just look at my vids, I just want to break the wall stopping me from getting better