New to magic, bought a precon, thought I upgraded it but not sure

https://archidekt.com/decks/26275006/jump\_scare\_my\_take

I bought the Jump Scare! precon (I love it, fits very well into my general play style) but it felt like it didn't interact well with other boards and didn't have enough ways to trigger Zimone's secondary ability. So, I changed about 20-ish cards with a focus on:

Double casting mana

Adding +1/+1 counters

Graveyard interaction

Board interaction

I would love to know where my board is lacking so I know what to look out for when adjusting other precons in the future. (I'm only interested in making level 2 MAYBE level 3 decks)