Your bird feeder is your responsibility to the birds. You can't just play "help". If you have decided to help the birds in winter, then you should do it regularly, for example, three times a week.
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Birds get used to having something in the feeder. If you forget to pour the grain, then the birds will simply waste their energy by flying to you.
Sunflower seeds are best for birds, but not fried and without salt. This is important. Do not give bread, especially black or moldy. It has few nutrients, so it is "empty food" for birds.
In addition to the fact that feed should be poured into the feeder, it should also be cleaned in order to maintain cleanliness in the places where the birds eat, so that there are no mass diseases.