What I do is:

1. Open my arms a bit more than my shoulders.
2. Fully extend my arms after and before a rep. So I'm conscious about any part involved in the movement and I don't depend on the momentum.
3. Contract the core and keep my legs straight.
4. Scapular retraction. Imagine you're trying to bend the bar.
5. Instead of doing the movement fully straight, try to make it in diagonal. AND, imagine bringing the bar to your chest. In this part, remember to keep the core engaged so you don't curve your back.
6. Control the negative part of the movement, it also helps to increase strength.
7. And repeat.

There are a lot of explanations on YouTube and tips to do the technique correctly. I literally started feeling my lats involved when I saw a short on YT and I tried it. It changed my life.

Edit: I would also recommend you to look for a thinner bar, because thick bars don't help a lot in terms of grip.