You Roll too much and Dash attack alot. You have to stop that. You rolled into attacks or grabs and Dashed into shields and you got punished for it. Mix it up and get some grabs in there. Attack out the shield inside of rolling. N-air of back air out of it. You can Up-B out of the sheild too if you like. Dashdance some. Dont always rush to him. You did that alot and got punished.
Need to tone down the Dsmashing. After you do a D-air, dont Dsmash right after all the time. cause after the D-air people can jump out of the way before you land your Dsmash. Run back after the D-air then ether b-air or reverse Dash attack.
Try to throw a turnip to a FC-F-air more. it works great. and if your fast enough and space it well, If they block the turnip and your F-air, you can grab them after and abuse the shield stun. They woukd expect a Dsmash, sho there shield will be up, and thats a free grab for you right there. just switch it up with grabs here and there., and dont be to predictable. That whole time I was able to guess what you was gonna do and i never played or seen you play. Work at it and you will see a difference.