18 107lbs Nothings working

It seems like eating twice the recommended amount of protein isn’t working for me. I’ve tried Fairlife shakes, protein shakes, protein bars, and adding more meat and carbs to my diet, but I haven’t seen much progress. I’ve heard peanut butter can help with weight gain, but unfortunately, I’m allergic.

What are some other tips that have worked for you to gain weight? For those who started out skinny, did weightlifting make a difference? If so, what’s the best approach to take? Based on the reference pictures I’ve shared, what areas should I focus on?

For any scrawny guys who’ve successfully gained weight or muscle, what steps did you take to start seeing results? All advice is appreciated—thanks in advance!