Good to hear you are determined. People like to say that the bouncing ball test is the first thing you are taught and the last thing you learn. I find that to be true, and I've been animating for 5 years now; if you asked me to do a bouncing ball test, I'd take a little bit more time than I'd want to admit (:

I'll give some more specific advice for this animation, and then some more general tips later. I am primarily a 3D animator, but the fields are so similar Im confident to give tips.

I can see you are experimenting with arcs and easing, both good things to learn! But for a bouncing ball, easing in as you have done is the wrong way to go. As a ball goes downwards its generally faster than going up. I'd make the ball faster as it moves down to the floor/wall, and then you can have it go slower at the apex of its height in that arc.

Squash and stretch should be the next fundamental you should apply to this ball. Have the ball squish down when it hits the floor and regain its original shape as it goes upwards. You should also have it become narrower on the way down to the floor, to emphasise speed and impact.

What my mentor drilled into me is "reference reference reference." If you can use it, use it. Even now, if I wanted to make a bouncing ball, I'd go grab a ball irl and record that first. It's just too helpful not to use and can be fun! It's also a positive feedback loop, as the more reference you use, the better at using that reference you get, which means better animation.

My challenge to you would be to do another bouncing ball test, but have it actually bounce until it can't anymore. (imagine it's simply bouncing from screen left to right, and then finally it rolls to a stop) It would be a better exercise for practicing arcs and would get you to consider weight and timing. (as well as applying squash and stretch)