As for the attack, as he fights, he learns and he learns quickly.
He counters Athena with divine spells and symbols of power. And as moment passes by, he becomes more proficient in dodging and attacking
The few times that Athena managed to hit him; Thoth has some kind of protection formation around his entire being.
To hurt him is to hurt him faster than his spell could protect him. And when he sees an opening, he would attack.
Armed with his ibis headed staff, he weaves intricate glyphs into the air, each one unleashing a burst of energy or summoning some kind of beast and darkly thing from the chaos to overwhelm Athena attack.
Thoth fight like a mage, Athena fight like a brave general!
These two battling each other would take some time.
It maybe would even take days or weeks.
Smart people sometimes are cautious. And Athena and Thoth is really the kind of people that would be cautious. Athena is in a bad position right now