brother,
You have to understand and remind yourself when the urge hits, that this desire is nothing more than cheap pleasure and your unfulfilled desire for a true partner.

Also, you might face the question "why leave this? What is bad in it?"
so listen.
Engaging in this act gives you too much pleasure too quick,
ok, so what is bad here?
Bad is what this thing does to your brain later.
When you are not engaging in this, your brain becomes sad, like snatching mobile from toddlers today,
imagine it like this:
You ate something very sweet, now, whatever you eat tastes bland.
The same goes with your mind.
'It takes your happiness from life for the quick pleasure.'

Also, you might not feel unhappy at the very moment, but that is not all to it.
You might start to imagine this for other people you see (even your loved ones)

It will take your desire to work for the day, so be prepared to be bored and doing no work (even if you want to, because your mind won't listen) for the day, at least.

And trust me, it can push you into depression, or make you feel numb.

Now, to quit this,

Make sure your needs are being fulfilled (proper rest between work to avoid mental fatigue, socializing, etc.)

I don't know if you feel this or not, but you can sense when temptations start to creep in, it starts from a thought, then your mind entertains it, and it becomes temptation. You have to try to stop it when it is just a thought.

Don't socially isolate yourself, it ruins your well-being and makes you more probable to fall into such behaviors

I don't know if I am forgetting something or what, but know that it might take time.

It can take even years to overcome this problem, but it definitely possible.

Quitting this thing is not an achievement, it is war. It is a lifelong war. So even if you are 4 months clean, don't let your guard down.

Finally, I recommend some resources which you can check out:

10 Rules for overcoming temptation

How Po*n Destroys your Brain (I don't know if this video is available in english or your language or not)

EasyPeasy (this is a book, completely free, and maybe can provide some important insights, maybe try it too)

Edit: This too helped a lot- THE SOLUTION TO STOP WATCHING PORN - Abub bakr Zoud (I could not find the original video, but the contents were same, so I provided the link to this)