Just hit the credits in Sonic Frontiers again. Still love this game even almost a year later. Here's a big post I wrote about it the first time I finished it if you wanna know what I think in detail.
I was originally going to just beeline it to the new free DLC chapter but I got to the first boss fight again and was like "damn this game's mood is sick I have to experience the whole thing again."
I also took the time to unlock the new spin dash ability they added in update 2. It's incredibly powerful, almost overpowered, but it's so fun to use and I'm glad to see the spin dash return in another modern Sonic game.
Enjoying Classic and Modern Sonic in equal amounts sure has its perks. Sonic Superstars is right around the corner...