Your damage and healing abilities are also based on your level.
Not to mention your healthpoins and mana.
At level 6 you're not able to use exura as it's a level 8 spell.
You have 175 health, 80 mana, 450oz cap naked and a very low walking speed.
At level 8 things change a bit, you have a little bit more of each, hp, mana and cap.
You'll be able to use some exori mins and other min spells.
But still, the level of the character is the most important factor on the equasion that defines the amount of damage dealt or healed.
The formulae can be checked here (https://tibia.fandom.com/wiki/Formulae).
You could have magic level 150 and you would still not make it.
I can tell you that you may attempt at any magic level or skill, but at level 8(or 6) it's unlikely you'll succeed if you want to rely on the characters ability, due the lack of damage/healing and capacity to carry resources.
If you could carry as much as you could buy you might have a better chance.
Of course, the trick here is to carry around as many mana potions and traps, as well as a demon shield and find the balance between mana potions and traps.
The traps will do the damage, not you, you'll focus on not dieing.
Boots of haste, time ring and energy rings are a must.
Then what you'll do is lay the traps and let the traps deal the damage instead.
Oh yeah, run, RUN.
It can be done with any character on any level, but at level 6 or 8 it's very unlikely you'll succeed if you want the character to deal the damage.