Suggestions (training packs/free play)

I've gotten back to playing rocket league recently and I'm working on getting better. Doing training packs and playing more free play. My current rank is this: 1s: p3-d1 (I've dropped because I'm trying out new things). 2s/3s: D2. (Highest I've been was champs in 2s but that was years ago). For all the veterans or higher ranks, what helped you get better? Certain training packs? Videos? What y'all did in free play and in the game. I don't care if I drop in rank, I'd rather get gud. Right now I'm trying to learn how to control the ball in the air and I want to focus on my shot accuracy. Any tips and advice help. I greatly appreciate it!