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For Sonic Mania? https://www.steamtrades.com/trade/VNpNd/various-games
Aslo, since you are new, are you trying to trade game you already activated on your account, or you have unused steam key of it?
anyhere https://www.steamtrades.com/trade/TiQOE/new-place-h-games-and-gifts-w-stardew-valley-offers for Sonic ?
Sonic Mania
Caravan
Deponia: The Complete Journey
Anna's Quest
Memoria
Memoria Soundtrack
Cuphead
Environmental Station Alpha
Ori and the Blind Forest
Hadean Lands
Interactive Fiction
Choice of...
Shovel Knight