Good evening Karizmatic,
I've been practising musculation for 4 years and I still lift and progress.
First, what are your objectives? What's your weight right now? Describe me your typical week, what are you habits?
How do you eat (what, how much, when)? Do you have any bodybuilding program? Have you been followed by a coach?
I've ever tried protein powder (I bought 2*3kg of whey) and now I don't take this anymore. For sure, it can help you gaining weight. But there are so much other things too.
I don't think that protein powder is absolutely necessary when you lift. It depends on your objectives.
Do you want to be more confident, to feel better in your skin? Or do you want to take part in contests? Both?
It all depends on your objectives. Who do you want to be?
(Sorry if I ask things you answered, I didn't have enough time to read all the topic )
Answer those questions and I will be happy to help you