Note: This is a repeat so you may already have it, the DLC however you may not have (and I believe is always free but you know the rule)
https://www.epicgames.com/store/en-US/p/cities-skylines
DLC:
Match Day - https://www.epicgames.com/store/en-US/p/cities-skylines--match-day
Carols, Candles, and Candy - https://www.epicgames.com/store/en-US/p/cities-skylines--carols-candles-and-candy
Pearls From The East - https://www.epicgames.com/store/en-US/p/cities-skylines--pearls-from-the-east