how to accumulate more leves

I am running out of leves i am down to 16 how do i accumulate more?

The only way is for them to be added each day. On your Timers menu it'll tell you when they will be replenished (only a few at a time)

You get 3 every 12 hours. Only way to get more is to stop doing them and let them add up.

I recommend saving them for the last 10-20 lvls of a gathering class if you plan on taking one. You should run fates or dungeons for combat classes.

I have my leves up to 100. I only allow myself to go down as far as 90 before I let them replenish. Even with the half level grind from 40±, I am able to cover it with Fates and Dungeons.