Aggraphine

Avoidability and Accuracy have been useless stats for years. Nexon themselves has come out and said as such. Thieves rely on skills that give them x% chance to dodge an attack, which is different from avoidability. Accuracy has been level-based for years now, where your ability to reliably hit something depends fully on the level difference between you and what you're attacking.

It remains to be seen what they're being replaced with in character cards and in potential lines, but this is a long time coming.

is it for new characters or people with a new account?

because i dont mind re-levelling some of the classes if it means getting to 150+ easier.

The burning event? if so then it's for new characters, and only one per account. You can't make another burning character unless you delete your previous one.

I believe it's once per world. The last one, I know, I had a burned character on GRAZED and one on Scania.

Roses are red.
Violets are red.
Everything's red.
Everyone's... dead.
...
LOVE ME.

Roses are red
Yellow's the sun
Don't ever talk
To me or my son

You could also simply stop taking the airships, and instead head to Six Path Crossway and use the Interdimensional Portal that leads to Pantheon to go to whatever town you please.

Honestly, the Battle Analysis thing should at least show you how many total kills you've gotten over however long a period of time you have it running for.