Choice Scarf
Smash Journeyman
Tighter spacing and more grounded neutral can help. Ivy's attacks seem pretty whiff-punishable so if you're closer your Fairs and Nairs should land. And you shouldn't be so inclined to midair jump when sent upward - save it for when you see his attacks coming instead of burning them immediately.
React to whenever he begins his Fair approach - he often catches you when you're just DDing around, so maybe watch him a little closer?
His Nair doesn't a lot of range, but Ivy does have quite a lot of aerial mobility that extends how far he can hit you. I wonder if U-smash OoS works here. Otherwise maybe wavedash back F-smash?
The Nairs were also used when he was edgeguarding you, and honestly those should not have hit if you sweetspotted the ledge. Gotta get those sweetspots man.
Other than that, mix up your approaches. Maybe sometimes drift backwards instead of forwards when you aerial jolt in. And your aerials are more effective when you land behind the opponent instead of landing where they are, but mixing that up should be what you actually do.
React to whenever he begins his Fair approach - he often catches you when you're just DDing around, so maybe watch him a little closer?
His Nair doesn't a lot of range, but Ivy does have quite a lot of aerial mobility that extends how far he can hit you. I wonder if U-smash OoS works here. Otherwise maybe wavedash back F-smash?
The Nairs were also used when he was edgeguarding you, and honestly those should not have hit if you sweetspotted the ledge. Gotta get those sweetspots man.
Other than that, mix up your approaches. Maybe sometimes drift backwards instead of forwards when you aerial jolt in. And your aerials are more effective when you land behind the opponent instead of landing where they are, but mixing that up should be what you actually do.