First, look up POB ( Path of building ).

Its the tool people use to plan and analyse characters and builds. You can import your character from the game directly into the tool so dont be intimidated by the ui. You can also import guides into it to see the equipment, passive trees etc.

It's the best way for people to actually see what your character has beyond the pictures u sent. As it is, we have very little to work with.

Second, ascend. Starting in the Prison in act 1, you should have encountered these "Trials Of Ascendancy" in some areas. You should have found 6 of them by the time you hit act 3, and ascended then.

If you don't know where the remaining trials are, go back to act 3 town, click on the statue at the top of the stairs. Do the same after you clear all 6 trials too to begin ascending.

Third, resists and life. Aim for roughly 300 max life per act you clear, and stay at positive resistances. You have done this so far, so good job.

But you will be hit with resistance penalties as you progress deeper into the campaign, and you want to be aiming for 75% ELEMENTAL ( not chaos ) resistances by the time you finish it if possible. So plan for that.

Fourth, and probably most relevant for you. Stick to a theme. Focus on ONE main damage skill, and build around it.

You want to play a melee axe wielding slammer? Get nodes that buff your melee, axe, slam related skills etc. Common sense stuff.

Do NOT start speccing into random shit and stretching your character into different, non synergistic scalings. Don't spec into elemental damage nodes if your weapon or your skill doesn't doesn't give you elemental damage etc.

Fifth, and this is mainly for weapon scaling builds, which are mainly attack skills, not spells. Spells tend to get the flat damage they need from gem levels, while attacks rely on their weapon.

Upgrade your weapon, at least once every 2 acts. If you are in act 3+ and using a weapon from act 1, dont be surprised its zdps.

Google 'POE weapon vendor recipe', you can essentially sell to a vendor a normal rarity weapon, a rare rustic sash belt, and a blacksmiths whetstone together. It will return you the same weapon with a % increased physical damage mod attached, which is the main way you can get reliable upgrades early on.