Although progression is important in MMORPGs like Path of Exile, it is more than characters Leveling Up and getting stronger, that is what most players should think about. Also, there is the process of transitioning from one place to another, increasing the difficulty along the way. Although this is straightforward and linear in most other RPGs, it has a little different when PoE is concerned, especially when it comes to the difference between Act 3 and Act 4.

It is obvious that a later part of a game will be more difficult, it is linear for most games in terms of the escalation of the difficulty. But with the transition from Act 3 to Act 4 in PoE, it is more like exponential than linear as Act 4 seems to be leagues harder. Although Act 3 is hard for characters that are starting out there, it is reasonable. But when it refers to Act 4, there is a lot of preparation needed to make that jump. That includes patching up holes in your character build and making more PoE Items possible.

The benchmark requirements for Act 4 are quite simple, focusing mainly on survivability since it is possible at the late game. You need more defense and more life but not get hit too much, as well as having all resistances capped. That last part is essential as there is a lot of basic damage in Act 4, especially for all the bosses. If you have trouble with bosses in previous acts, then you may want to reassess your character.

That is when players realize that trading in PoE is a necessary part of gameplay. You can look at trading boards and the global chat or forums for buying and selling PoE Currency items and gears. However you deal with it and wherever you get it, you should find 4 and 6-linked poe items with big bonuses that will make your character much stronger and prepared for Act 4, PoE Exalted Orb will be your first choice.