I built my first deck (commander) from scratch and was pretty sure it would be competitive but it got dusted all 5 games I've played. Experienced players- any ideas on how I can improve this deck?

Here's what I think is going wrong
I have too much mana.
It's a bounce deck but doesn't have enough defensive creatures or protection artifacts


Is there a strategy that I should be focused on here?

https://deckbox.org/sets/3044729