SPELL POINT (MENTALITY)

The Spell point by Level table applies to bards, clerics, druids and wizards. For a paladin, ranger and artificer, halve the character's level in that class and then consult the table. For a fighter (eldritch knight) and rogue (arcane trickster), divide the character's level in that class by three (Rounded down). Apply same rules for any other sub-class.

Every time a character cast a spell, calculate the spell point cost from its table and reduce it from the spell point points the character has. When character spell point reaches 0, he/she can’t cast any spells of 1st level or higher (cantrips cost no spell point). After a long rest, a character regain half of the total spell point they have rounded down.

Consider that players can use spell points instead of spell slots as was mentioned in the DMG with a small difference. Players don't need to create spell slots with their spell points but instead the can use the spell points as was described in mentality/spell point table and simply reduce the amount of the spell point cost from the total amount similar to Mana in video games.