Try, junctioning some powerful magic to your str. stat. Some good candidates would be any of the 3rd level magic spells. Meteor, and ultima, are some of the best. 100 of each spell is the best.
Dont worry.

If all else fails it is possible to defeat the whole game, evan optional side bosses with the lowest possible stats, your first weapons, no junctioning of any kind. I am in the process of doing it. And plan on defeating ultima weapon with these low stats. Its possible.