Bearded person here. My basic advice, stop using your body wash as shampoo, even 3-in-1. Find a quality shampoo and figure out a conditioning regimen. It’s different for everyone, some people use a traditional conditioner that you rinse out, some use oils, others use balms/waxes/butters, and generally some combination. I’m lazy so I’ve found a two product system for myself.
Oils/balms/butters/waxes are typically put on when the beard is damp, and they have different levels of hold. Some things to know about those products: apply the oils to your skin under the beard and then comb or brush it through; also, use a product with quality oils like jojoba, argan, and coconut.
Lastly, find someone who can style it the way you want or get clippers and watch some videos and style it the way you want.
There was an article written about that very thing when the movie first came out.
https://www.thewrap.com/sinners-irish-vampire-meaning-history-explained/