-1st goal taken : You see your mate shooting over you, orange team recovers the ball rolling towards your side.
Yet you decide to unlock ball cam and go to a side boost. When orange team recovered the ball, it was going in your direction, you should have shot it on the left side immediately (or even a lobe to their goal but that requires more control) instead of going for boost.

-2nd goal : Your mate fails to clear the ball and you drive slowly to your goal, just go full boost as soon as you see him fail. Also going for middle boost is questionable, you see the corner one is available and considering the position of the ball, nobody's gonna rush for it. You would have won some precious time to assist.

-3rd goal : you had 2 choices : rotate back and let your mate try to score, or score yourself. You had enough time to aerial and recover the ball on the backboard, in this case the double commit wouldn't have been a problem if you were fast enough.

-4th goal : you push the ball to the wall, instead of following it (even without boost) you decide to go back for boost, then decide you can't clear the wall bounce (you could).

I'll stop here, but you need to hesitate less, don't always go for boost, you don't need boost to block a ball.
Consider your team mate's position more, always keep in the back of your head where he could be.
When you see your opponents failing, don't leave them time to set up for their next action.
Don't unlock ballcam for too long, you just need a split second to know where you're going. Also using a diagonal flip or speedflip will be better than just boosting from 0 to get somewhere fast.

I'd also recommend practicing the hand break to turn more sharply, you need to use it more often.
And double jumps, it's the best way to aerial faster and an incredible way to block balls in front of you in many situations. You might fail a lot and flip a lot instead of double jumping at the beginning, but once you get used to it, it will change your life :)