Any good training packs?

I’ve been playing Rocket League for like, 5 years and I am stuck in late gold/early plat. Look, I know I’m not good, but if you’re simply not better than your own teammates (I’m talking about randos) you ain’t ever getting out.

What advice, training pack, settings, is there any recommendations anyone has for anything? I know this is super vague but if I’ve played this long I feel I could get better.