"This limit applies jointly to all sources of damage over time (including ground effects), and after all modifiers to damage taken by the enemy, such as the damage reduction provided by Delirium or inherent to Uber bosse"

https://www.poewiki.net/wiki/Damage_over_time#DoT_DPS_limit

bro this game is not a kind of game where you spend 2 hours reading content and get everything

even players with thousands of hours have holes in their information landscape

so just play