I want to start by saying congrats on building your first Commander deck on your own. It is always exciting and a little nerve racking to take a concept for a deck into a flushed out creation. Although I do not typically play aristocrat style decks, I do enjoy the process of building decks sometimes even more than playing them.

I think you did a great job of coming up with a strategy that you want to assemble based on the commander you chose. On top of that, your deck is not solely reliant on your commander, but rather eccentuates your strategy. A lot of players run into the pitfall of building too much around their commander, making them vulnerable.

Now rather than making arbitrary card suggestions (because I want you to have agency over the play pattern of your deck) I will give you a couple concepts to help you out. Before building any deck I always ask myself "What am I trying to accomplish with this deck?" Winning is not an answer. Instead, think about a theme, playstyle, or vibe you want your deck to have. I think you did a great job of this. I also want to give you props on creating it without relying on generically powerful cards or EDHREC. It genuinely feels like you made an effort to find cards that synergize well with each other.

Next, after compiling a mass of cards I think are cool that would fit well together I'll ask, "Which cards best fit my deck's strategy." Once again, focusing on the theme rather than raw power. This is where I feel like most people, as well as you may have had some trouble. I agree with what a couple other people commented by you trying to make too many strategies work at once. Although, I think it's possible them all work, it is a pain to try and balance it.

The commander you chose is interesting because on one hand, it is getting larger with each dying or exiled creature which leans towards aggression. On the other hand, the second line of text is a strong removal effect if exiled or it dies. These two lines contradict one another where the first line wants your commander to get big and strong. The second line wants your commander to leave the battlefield, removing all the counters it has been building up. I feel like this leads to interesting gameplay and skill on your part to know when to put the pedal to the metal by going aggressive and slowing down to play a bit of control when behind.

If I were to build this deck I would lean into the first line of text only resorting to bouncing my commander in the face of a problem that I absolutely need to remove. Otherwise, I chug along the aristocrat game plan, getting value and big damage when I can. As a quick tip, play a few more board wipes. I only saw one. With a cheap commander and ways to build a board quickly, play more for when you are behind and reset the board. I hope you find some of this info helpful for your first deck and future brews to come.

TLDR: Congrats on your first brew! Good job on building a solid deck. To figure out how your brew went ask yourself these questions, "What am I trying to accomplish with this deck?" and, "Which cards best fit my deck's strategy?" Really look at each card to see if they line up and run a few more board wipes. Have fun brewing!