Need to lower my mana base, myriad/ETB tribal

[loud ruin]

I recently built a myriad tribal loaded with EBT effects to slam my way to victory, however, when goldfishing, I find that I'm waiting until turn 4 or 5 to finally put creatures on the battlefield.
What are some good suggestions to lower my mana base while still piloting to victory?
https://www.moxfield.com/decks/JxUaFeUOVUi4GlQx-FMddw

[cedar helm]

Cool theme

from what I'm seeing I would add more ramp since your myriad creatures are pretty expensive

Plus your commander is 6 mana

Maybe add more myriad creatures that are cheaper in mana value (if they're any cause u don't know much myriad cards)