Need some walking training advice for my 5 year terrior pitbull

I’m seriously considering real training for my dog we’ve tried to train him as much as we could since he was a baby every single walk turns into the same frustrating experience. The second we go outside, he pulls nonstop and wants to sniff literally everything. Every few steps he stops and gets locked into smelling something on the ground I have a blue harness and the leash is hooked on top of it which also could be the reason why this happens.

He’s my bestfriend and I love him and spoil him but I feel like I can’t even enjoy the walk because I’m constantly being pulled or stopping every two seconds. What should be a relaxing walk just turns into me getting annoyed the whole time.

I know sniffing is normal for dogs and it’s how they explore the world, but the constant pulling and stopping makes the walk feel exhausting instead of enjoyable.

Has anyone dealt with this with their dog? Did anything help make walks more enjoyable? Will getting hook areal trainer help?