I'm stuck even completed all the requirements of Lake temple altars

[patent sage]

Hello!
I have some questions, currently my progress is at rank B and I have completed all the requirements of Lake temple altars but other than receiving the mythical beast there is still no sign of unlocking the path. leads to Savana.

Before that, I heard my friend use some mods like increasing movement speed and translating into Vietnamese language, but because I heard they could affect the game, I removed them and reinstalled them. But still stuck right now and don't know what to do next, please advise me.

[toxic yoke]

Savannah opens after completing 18 offerings. If you never accessed it, try going to the spot behind Paul and Anne's house, break the big rock and then you should be able to go up and across the bridge it if you have the quest to go the the savannah from the giants.

Regarding town rank, it seems you're missing 23 points. The easiest way is to complete collections in the museum (insects, fish, fossils, artifacts, gems, critters) it will give you extra 40 points.
Otherwise just donate to the museum extra 8 things and you'll be good to rank A. @patent sage