This is what I did, might not work for you but it worked pretty well for me. My birds are fairly young probably less than six months, and I’m using zupreem natural pellets for budgies.
1. As soon as I got the pellets in the mail, I introduced them to it by putting one right next to them to explore it and understand that it’s food.
2. Then I completely swapped the seed mix in their cage with the pellets, so it was just pellets in the cage for the remainder of the day. I would leave the pellets in all day but they didn’t eat any, they would just come down to the food bowl and scream at me for their seeds.
3. Since I knew they weren’t eating, I gave them some seeds that night just so they didn’t stay hungry all night. Then in the morning, I would give them seeds as well so they can have something in their tummy until noon or something. Like I said pellets are still in the cage 100%. So basically, the first week and a half was seeds in the morning and at night (about a small handful in the palm of my hand each time). Oh and also, I would put some pellets in my hand and they would eat it no questions asked😂 but they would barely eat the ones in the food bowl lol.
4. During the second week i noticed they started to eat from the pellets in the food bowl, but they would only eat them if they were slightly crushed cause I think they might’ve been to big even though they were budgie pellets. At that point, I stopped giving them seeds at night and only in the morning. Did this for another week and a half, then completely stopped giving them seeds after the 1st month and now they are on pellets. I still give them seeds from time to time just as a treat.
This is how I did it, but if you choose to do this option pleeeeeease be careful not to starve your budgies. Their metabolism is extremely fast so 4 hours of food can be like days without food for us.
*Also mods, please correct me if I’m giving bad or potentially harmful info, but this is what worked for me. *