My general tips that can help you be more efficient is:
Circling enemies can help you avoid some attacks, such as the Elder Mushroom, I can avoid 50% of their attacks by circling them.
Clump up enemies, you can hit a few at a time. Just gather the attention of 2-3 enemies and swing at them when they are close for faster EXP.
Go to Mushroom Grotto under Mushroom Forest, many people still don’t know about it, but for levels 5 and up it is the most efficient way. Don’t be afraid of dying because you spawn right back next to them. There are at least 15 Elder Mushrooms spawning close to each other.
You can go into more detail or add your own tips in the comments below.