If you use shampoo bars can you help me out here?

I have recently (a few months ago) switched to shampoo bars as part of an overall effort to reduce my use of single use plastics. My hair is shoulder length and pretty thick and I have quite a problem getting the hang of effective use of the bars. The length seems to be a large part of the issue. Do you have a preferred brand? Any tips to share?
My main problem is getting enough lather to my scalp.

General question, honestly asking for help about use of shampoo bars, not about other ways to reduce plastic waste.
Thanks