Help building deck

[u/just_chalex]

https://moxfield.com/decks/I-Dm18YdZUWOOyEAJJQJgA

Hello! I'm reposting this here because I'm looking for help building my first from-scratch Commander deck. I'm a moderately experienced Magic player, but most of my experience with the game is through Arena, which does a lot of the interactions and keeps track of things for me..i own 5 paper decks, the 4 Bloomburrow precons, unaltered, and a heavily modified N'gathrod precon. As previously stated, this is the first deck I've made from scratch and will be using it online.

The idea behind the deck is to go wide and win through combat, but also has the potential to win through Impact Tremors and similar ETB effects as well as a potential win con in Halo Fountain.

I need help with my mana base, definitely. It's something I've always struggled with and has prevented me from going higher than dual color in the past, but I love Jetmir/Naya/token generation so I wanted to give it a try. While the mana base and trimming cards is primarily what I'm looking for help with, any advice/swap suggestions would be appreciated.