Shallow story, sloppy plot, iron plot, cheap harem,
MC rushing everything,, become strong ain't worth your and your teammate life kiddo
You're still a kid,, take your time and do other things like make connection, acquire money, spread influence, etc
It's not a race, stop rushing!
MC suppose to be Old Great Magician, but noo,, turnout MC just immature, power hungry and sad person.
Like you playing game and rush leveling up,, without thinking about equipment, teammate, potion,, etc.
Like your character lv10 but rush into lv20 area,
You get more exp point but at greater risk of death
Dunno how many times MC and teammate suppose to be died but Iron Plot save them. It's become routine for this manga.
Rush leveling up/fighting something too strong - almost die - iron plot - cheap harem/shallow story - repeat
My advice,,
just read the chapter in front of you, don't remember anything before that and don't watch the manga as a whole.
Probably you'll enjoy this manga by that