Hi! I know how hard it can be to look back and see all you did wrong on caring for birds (i've had a canary for a time and i treated him wrong for some years because i just did what i learned from my dad instead of making my own search) but dont be too hard on yourself, im sure you are doing your best now
About geting them to eat healthier foods, i would recomend making bird bread (there are tons of recipes on youtube), wich were invented especially to get stubborn birds to eat vegetables, so that might help. I've seen some people putting seeds on top of vegetables to get birds to eat it, i dont know if it works or not but its worth a try... Brocolli might be a little easier to get birds to eat as the little leafy things on the top may look like seeds for them.
About the song thing, i've heard that listening to other cockatiels may make some feel threatened, so that might explain why they scream to the videos. Anyways i think that puting songs in a 8 bit theme may help them to learn (there is a plataform that i think is called chrome songs, i will take a look on the name and say it here later, but i think it might help to create a song to teach them)
Well... i'm not an expert but i hope i helped... btw are you brazilian? Pipoca is the name for popcorn in portuguese so... it would be nice to find another brazilian here haha
To add to the previous comment about good ideas like bird bread....
I can very well understand your feelings, because my cockatiels were picky about any veggies from the very beginning. It can be quite hard to train them to eat veggies, if they didn’t get used to them as young. However, I finally found something that tastes to them, maybe you could give a try, too:
Sprouted seeds: picky parrots may learn to like sprouted seeds, as their texture and taste is very close to non-sprouted seeds. You can first give them slightly sprouted seeds that were incubated only for 1-2 days – they still look and taste very similar to non-sprouted seeds. It can be the very same seed mixture which you would give them anyway, or a special sprouting seed mixture. The mixture must be of high quality, so that all seeds will sprout (the non-sprouting, poor quality seeds may become a potential source of contamination, if you don’t remove them from the mixture). If done in a very hygienic way (rinsing them carefully 2 times per day, cleaning the seed container carefully after use), they are safe and full of nutrients – much more healthy than non-sprouted seeds. Beware of any bacterial contamination! If the seeds smell or taste different, discard them right away, and don’t give them to your bird. My birds love sprouted seeds, especially sprouted sunflower seeds - of course, it is good to offer them a variety of seed types, not just one.
Herbs: You can grow herbs in a pot, and they are very durable, if you water them frequently. In contrast to any cut pieces of veggies, you don’t need to discard them after 2 hours, as they are eatable for many days to even weeks. My cockatiels didn’t eat them at first, but they liked to play with them and shred them, but after some time they learned to eat them. Their favorites are herbs with small leaves: thyme and oregano. Note that parsley can be fed to them only occasionally, as it contains oxalic acid which absorbs calcium and forms calcium oxalate, which in turn can lead to formation of kidney stones.
I hope you find something healthy that tastes to them! And there is no reason to blame yourself too much for the past, it is better just to focus on the future - you can always strive for better. I bet no-one is a perfect owner. I suppose we all should keep on developing towards better. In the past, there was also not as much information about good care of cockatiels, or the information was very different from current understanding. Research and common knowledge evolve all the time. So I suppose it is good idea to check for up-to-date information every now and then, and not to rely only on one's own experience.
@Kamu@Idontknowwhatnametoput Thank you so much for the tips and comfort words! I was really overwhelmed about it when I wrote the text, so it came out a bit dramatic, but again, thank you for the sweet words. Sorry for not reaching out earlier, I was so busy I forgot to check here 😕
I'm still having some problems with these 2, tried some of the stuff y'all recommended and so far not much progress, but I'm going to keep trying until they can get better and eat healthier. I still need to check the bird bread though! I think they might get interested in that.
And yes! I'm Brazilian haha. I love giving food names to my pets! I had another tiel named Tapioca, she was all white hence the name Tapioca.