1. Don't touch or mess with them. Don't pet on the head. Try to pet the chest or back so ears aren't consistently pinned back.
2. Give bully sticks, knuckle bones, and neck bones. These items contain lots of nutrients used in making cartilage - thereby helping with ear development. Don't overdo any of them - or else you will have to deal with diarrhea, constipation, or excess calcium that interfere with correct growth.
3. Give a packet of unflavored Knox gelatin once a day.
4. Feeding raw meaty beef bones 4-5 times a week helps to get the ears erect. There are over 150 muscles in the jaw that also run up to the ears. With all the tugging & chewing on bones, it helps to strengthen those ear muscles.
5. Make sure ears are clean and free of mites or fungal or bacterial infections.
Infections cause ears to drop.
6. Feed high quality kibble or a complete raw diet. Crap food produces crap bodies 😉
A good supplement is Solid Gold Seameal.
Add small amounts at first to get puppy used to it.
If your pup's ears haven't come up by 6m, contact a vet or your breeder and consider taping. Till then, be patient - they will be up and down until the permanent teeth are in.