EpicSpire is a trader game that offers various bonuses to help you become the best trader in the world. The bonuses you receive are for completing each Tier, not after each quest.

This means that if you don't want to restart your world, and have already completed some Tier quests for the trader, you can go ahead and type the following lines into the game console (Press F1 in-game)

For each tier that you completed:

Give the quest Complete the last quest in the current world.

You'll get all the rewards including the skill points.

You can now use the skill points to buy things in the EpicSpire store.

This means that you can now buy things using the points you got from completing the quests.