I was wondering if it would be possible to unstack my essences in somehow, I already looked but couldn't find anything about it, should i keep stacking it? hehehe

It is not possible to split stacks of essences on Ladder Slasher.
If you plan to use them on your own, you can keep stacking them. Otherwise it might be better to make seperate stacks.

Ohh thx AMIGO! This will help me to plan better hehe

In many cases stacks of 100 are a good starting point if you plan on selling them on the marketplace.

There is an active suggestion about being able to split stacks of essences, feel free to leave your vote here: https://forums.d2jsp.org/topic.php?t=83930209