This is a very simple strategy that i did when i was in tier 1. Most people tend to just mining for 4 hours to get 3.5k for tier 2, but i did it differently. My strategy was to kill all the animals in the pen. Pigs and cows drop meat which can be sold for 0.8 gems, it might seem like a small ammount but when you get an axe, and spam it for a long time it you will get a lot of meat. Try targeting the cows, because they drop leather too, and that sells for 1.8 gems! Good Luck! If you want more tips just PM me.