I need help with potty training

I have a 6 month old maltipoo, now potty training has been so and so. With days where we have no accidents and days where all he does is go inside. Now yes my fault for using peepads for a long time, but also not my fault because our area was notorious for parvo and we were scared for him to get it. But recently every soft surface has been his breaking point. Doing his business in them, even our beds!!! We have had to wash our sheets so many times that we dont allow him in our beds anymore. We have a doorbell that he will ring to go out, but he barely does anything whenever he does go or will take 10-15 minutes to do his husiness which is annoying because we only have a front yard, that is not fenced. And at night is a whole different story. No matter what we do he will go inside his playpen no matter what. We cut his water at night, take him out to pee and poo at around 10 ish pm, and we have even tried waking up at around 3 am to take him out. But no matter what he will go inside and we have to clean it in the morning. How did you guys do your potty training? Any tips and help will be IMMENSE because we are seriously thinking of sending him to a camp for training for 30 days as they have a promo right now