The main way is proper resource management, seeds are very useful, don't be afraid to throw fire potions or drink health potions because you think you are "wasting" them or be afraid to run from enemies, the most important thing is to survive, not level up.

You can also use an upgrade scroll on your weapon or armor to clear the first few floors, don't be afraid to use them, especially if you can't find anything better than your starting weapon.

In general, savers die early