>>3831461
The best way as far as I know is a combination of the Immerse skill from Ino's support tree, Elixirs of Extinction that you can get deep into Ovitri (kinda grindy to get a lot of, though there are a bunch of freebies in the dungeon), and the Calamity Star Staff's passive 10 TP regen per turn (+15 TP per turn for the +1 version from Ovitri). The War God Bangle isn't too worth it since it's only 5 TP per turn, but you can use use it if you want. Sage's Mantle unfortunately doesn't affect TP regen from equipment or skills, just the gains from attacking or being attacked.