Is it too late?

I was looking for a new weapon and saw the Cursed Greatsword of Artorias and I liked it. My stats are STR 45 DEX 20 INT 13 FAITH 20, so for the weapon to be effective, I'd probably need to level up my INT and FAITH. Is it too late? Or should I just stick with STR? I'm using Black Knight Greataxe, Black Knight Sword and Fire Washing Pole +10 now. And if I should stick with STR do you have any good STR scaling weapon in mind? Help is appreciated, thanks in advance!

ManSerpent Greatsword, Demon Great Machete, Great Club, Large Club, Demon Great Axe are all great strength weapons.  Great Club and Demon Great Axe hit hardest, MSGS and LC have decent speed; LC has an interesting moveset.

You usually want to stop at 40 for str if one handing str weapons, with the few heavier exceptions if you insist.

Artorias weapons are for higher-than-standard PvP levels, since you really need all of the stats above minimum for the scaling to beat out a simple weapon +15 with the proper stat allocation.