Take all the eggs, boil them, wait for them to cool and then put them back where you found them.
Let them sit on those eggs up to 3 weeks. If they haven´t abandoned the nest before the three weeks, remove everything and switch up the cage, rearranging perches, toys, bowls. Introducing a new toy and a variety of foraging activities helps.
I say this because your birds are on an all seed diet - not good for breeder birds at all, and your bird is only 1 year old. Cockatiels do better from 18 months.
And the obvious, lack of experience and research.
If you want to breed in the future, get your birds on a better diet, and research well. You still have a good 6 months before they get to a better breeding age, so tonnes of time to prepare - researching, buying all the equipment and finding homes for potential chicks.