Welcome to DF! You will find lots of great information here.
I also have a lab x BC and she is WILD - in a good way!
She just turned one year and I just love her. I will say that she NEEDS a job. I started basic obedience with her literally week one and I think that made a huge difference. Check out the housebreaking stickies here on DF, I think they could help you. Personally, I'd go back to square one with housebreaking because it seems that your pup may be confused.
This is a mix of two VERY smart and VERY active breeds. Going from a cockapoo to a lab x BC, I can see how you could get frustrated! They are so different, IME.
What worked with my girl:
Daily walks - AM and PM, 1.5 miles each way.
Training- simple things: sit, leave it, watch me, her name, etc.
Toys- I buy a lot of toys. They necessary for her, not an option. I buy a few when they go on sale and rotate them so she thinks she's getting new toys more often than she is.
Chews- Bully sticks/Himalayan chews/Kongs stuffed and frozen
-Find a positive reinforcement trainer and get enrolled in some classes. Even if you can do the training yourself, the social aspect is good.
-Start training now, Kikopup has a great YouTube channel.
-Square 1 with housebreaking
-If you could put her/him in doggie daycare once or twice/week, that would tire her out to relax at night.
As I said, my girl is a year old and shows no signs of settling down. I recently took her for a 13 mile hike up a mountain and when we got back down, she was wagging her tail and running around me. She was ready to go back up, I was ready to nap!
Oh, one more thought, when I was housebreaking, I tethered her to me when I was home. She was in her crate when I wasn't home or couldn't tether her (like when I was cooking - I didn't want her near the oven). That allowed me to get used to her signs of "oh I gotta go!" and I think it got her used to being in my sight. Now, she follows me all around the house
I hope this makes some sense. I'm obsessed with my dog and could go on and on and on.... I'd love to see pictures of your pup!