There are a lot of different directions to go with the Boros creature swarm style of deck.  One of the big problems is that you're relying on creatures chipping away at life totals rather than getting in for massive swings.  This immediately puts you at somewhat of a card disadvantage so enchantments like Marshall's Anthem and Dictate of Heliod can be force multipliers.

Appreciate you looking through the deck! I would also take suggestions for cards I don't own already. Some stuff that's in the deck currently is just for filler. I do agree with the changes though.

Looking through what you have and other cards in your collection.  I like that Street Riot enchantment.  I like the Abzan Falconer + mentor interactions.  I also forgot about Skin Invasion, not only does that give you instant boardwipe recovery but helps your Novice Knight.  I think Make a Stand is a great card for commander format since your deck relies heavily on being able to make attacks which can be challenging when they die to boardwipes.

I'd swap out a few cards: Claim the Firstborn (limited targets and effectiveness)  for Banishing Light (broad spectrum removal), Garrison Sargeant (expensive but low power and not a knight and ability almost never triggers) for Custodi Squire (some ability to recover after board wipe + built-in evasion) , Fresh-faced Recruit (not a knight and not that impactful) for Roc Charger (evasion + gives another creature evasion), Isolate (very limited targets in normal game) for Pegasus Courser (evasion + gives another creature evasion), Implode (decent but fairly rare that destroying a land at sorcery speed will put you too far ahead) for Demolish (gives you more targets in typical game), and Amulet of Safekeeping (works against your tokens) for Swords to Plowshares (premium removal).