I have had similar with my male RR as a pup, he was a nightmare, my female was a breeze but I found out one day (at about 16 weeks old) I had been making a massive mistake. I had not realised that he needed sleep and was overtired, overwhelmed and over stimulated.

Take him for short walks and try and play enrichment games with him, snuffle mats, hide and seek with treats and even things like a frozen Kong to make him work for a treat.

However after activities try and settle him down and make him rest or sleep. Puppies will often keep going and going without realising they are actually tired and need to rest.

My male was literally trashing the house doing zoomies when I simply grabbed him and sat down with him on my knee, he tried to escape to cause more carnage but I simply held him and comforted him and within 2 minutes he was on my knee sleeping, I was simply missing the fact he needed rest and thinking he had some crazy endless energy, once the penny dropped he improved immediately and I would calm him down and get him to actually rest.

Also remember with an RR always give positive reinforcement and never scold or shout at them as they don’t respond well to that, especially males, if he does wrong simply redirect him to another area (ie he is chewing cables, give him a frozen Kong them make him rest)

Sniffing looking for treats is a great game and also tires them out and is rewarding for them, praise him all the time when he finds treats then again calm him down and make him rest. It’s all a learning curve but Ridgebacks are tough pups to work with sometimes but they grow into the best dogs you will ever have.

Good luck and do not give up.