If you own a boat and you are able to use a bow or magic, you can get as much strength and stats as needed. First, make sure you have arrows, reagents, recall scrolls, and runes for your boat and a town. Dock the boat at any island that has monsters, especially ones that do not have any visitors, as monsters seem to swarm. Allow the monsters chase you back to your boat. Get on the boat (you will need a friend to be standing inside to let the gang plank down) and the monsters will not be able to get on your boat. Then, pick them off one by one with arrows or spells. If you run out, recall back to a town and buy more. As the monsters spawn, you will be able to do this as long as needed and gain skills and statistics.