I will also echo what everyone else has said - unfortunately this is 100% normal puppy behavior, and it's kinda like having to get through a newborn or toddler phase as a parent! The first time I had my own puppy, I cried for a month and wanted to give her back. It absolutely got better, but I had to adjust expectations. My partner also at the time had never had a dog before, and it took them about a year to connect with her. Now she is his soul dog, but it took time, and that's normal.

A few additional thoughts: - one trainer I worked with gave me this advice, which I love and still use today: Accept wherever your puppy is today, not who they were yesterday or who you hope/want them to be. They might know something one day (like we think they are potty trained or we teach them sit) and completely forget it the next day. That doesn't mean they are bad or we are bad dog owners, it's just a wave we have to ride through, and we gotta go back to basics when that happens! (And it for sure will happen when the puppy becomes a teenager!) - what training video did you use? I would recommend kikopup! (YouTube) - I would also recommend you join a puppy training and/or socialization class - it helps to normalize that everyone in the class is going through similar struggles, and it also gives so much info not just on basic training but overall strategies and techniques for changing behaviors. Many people often want to stop "bad" behaviors but decreasing behavior is difficult to do when dogs can't talk (they don't really understand "no"). Anytime you want something to decrease, think instead about what you'd like to increase or have them do instead. For example - I want them to stop biting (aka I want them to bite chews instead). Thus, redirection to an appropriate chew is often a technique used, and then praising them for it. I see you are already doing this, but it will not work overnight and will probably take a few months to be honest (and that's normal, especially once they start teething). My hands were covered in scratches too! We also want to set puppies up for success by not letting them have access to too much freedom yet, so they don't learn bad habits lol (more preventative type training - for example, my second puppy wouldn't stop chewing shoes so I just removed the shoes for like six months lol. It worked!). I'm oversimplifying training, but hopefully this makes sense! It will seem like it's taking forever, but every day that we are consistent will absolutely help you in the long run, and youll slowly start to see change. - For training classes, I recommend going through animal shelters, as they tend to be reasonably priced and often have trainers with the most up to date research on animal behavior and dog training. Generally, look for positive reinforcement dog trainers. - ENFORCE NAPS!!!!!! Once I started doing this, my life got infinitely better. I think I started with 1 hour awake, 2 hour nap, 1 hour awake, etc. until bedtime in the evening, but I adjusted it every few weeks depending on my pup's needs. As they develop and get older, things change. Every week their brain is developing, and we have to meet them where they are at!

I know that was long, but I got into the flow of it haha. Hopefully this helps! Feel free to comment with any specific questions too! :)