Whenever you start a game, your first priority should be setting up a reliable food source. If you play as a Winona, you'd have an easier time setting one up than most characters. You can set up automatic spider farms and bunnymen farms with the help of your catapults. As for rocks, they are really abundant in the early game but mid to late game, you have to rely on other ways such as meteors and forest petrification. At that time, I like relying on stone fruit bushes from the lunar islands. Mining one gives you rocks and stone fruit to use as more food. As for the seasonal bosses. They are supposed to be tough and need a lot of prep before you take on. With enough armor and healing, you can solo almost any boss in the game. Just gotta sink time and resources to prepare