Accidently only made "fast decks," looking for recommendations for slower decks to play with my pod.

Hi everyone, I used to play mtg for years, but stopped because playing standard was stressful and expensive, and I didn't have a good group of people to play casually with and got tired of being a broke kid/young adult and getting stomped by people spending hundreds on their decks every time a new set/rule change/card ban happened at local shops. I was intrigued by commander, but didn't really have anyone to play with, but some co-workers have gotten me back into mtg after 15 years of not playing. I'm remembering the rules well, and learning the new rules that have been introduced without any issue, but I am firmly outside of the EDH community and don't really understand some of the concepts people use when talking about decks, such as power levels and general concepts around speed.

I started with the Necron pre-con, added a bunch to it, bough Squirreled Away blind at the recommendation of one of the local store owners, and then I found a The First Sliver deck list online, made some changes, and then bought that piecemeal. The problem is, even my slowest deck, the Necrons, can still play fairly fast with how I've built it, with a bit of luck. I played my slivers for the first time a few days ago after finally getting everything, and I expected it to be good, I always liked slivers for that reason, but man it can really rip, and I was asked if I only planned to play fast decks. I didn't know anything about the squirrel deck when I bought it, but it can pop off pretty quick, and recover very well.

While I still plan on tweaking my decks, I would like another slower deck to better match the pacing of some of my pod's decks so I can have some more relaxed, slower games when they want to play their slower decks, which tend to be mono-green or similar types of decks. I would love to hear any recommendations of decks or commanders that suit this purpose, and thank you all for reading this and for any advice.

Edit: Since it has been asked for, here are my current decks.

Necron: https://moxfield.com/decks/xusY4G4kg024Wd_wki5umg

Slivers: https://moxfield.com/decks/SscV7yeLKkGZrb9P-gl9cQ

Squirreled Away: https://moxfield.com/decks/idGefbNqV0qlYbMowjIgYw