Well I just don't see how you can make any melee attacks.
That's likely because you don't understand the game mechanics.
Your base chance to hit a target that isn't CC'd is based on your own offence rating, your target's defence rating, and a modifier for difficulty, to which is then added adjustments from e.g. buffs.
Your own offence rating is the one thing you can easily affect. For strength based, it is:
40 + 6*Strength + 3*LuckyCharm
If you are skimping on strength in favour of other stats, you will find your character becoming ever worse at hitting enemies as you progress in the game, as enemies gradually increase in their defence rating.
This becomes especially obvious on the hard difficulty, because there's a negative to-hit modifier there.
In which case you'll want to use either Precision Stance, Blessing, or Blessed Earth to help your gimped melee character to hit more reliably.
As a quick possible repair, consider investing points in Lucky Charm either at levelup or equipment (or both) if you haven't done so already. While not as effective as the primary attribute governing a weapon, skill points are usually easier to juggle.
Alternatively, as others have pointed out, if your primary attribute is so weak that you can't hit the broad side of a gazebo even if you bless or use precision stance, start concentrating more on applying CC status effects to get you a guaranteed 100% to hit. It isn't nearly as useful as having a strong primary stat and 90-100% hit chance against just about anything, but it is still better than your awful examples of sub-50% hit rates.
