Wizardry Zeo, Black Clover Recommendations
both are mc who are weak when it comes to using magic despite being mages one by choice and one not so much
both use swords to fight and are totally badass but they're not invincible as they don't know how to use their powers properly
both are about kids who are orphans
both have a mission and a goal which seems out of their reach
both gain teammates but in this sense wizardry zeo is much darker because people die in every few chapters who seem to be important but never the less they die.
both are in their mid teens and travel around doing quests