Knowledge can be deceptive, because knowing all the traits of an attachment style and trying to mimic secure behaviours is much like reading a poem in a language you don’t speak.
You can read the poem, but you don’t understand the language, nor do you have the actual felt experience of security, good self-esteem, and the experience of being securely attached.
This is not to discourage you, but this is to point you towards deeper work, and not work that leaves you disappointed that you can’t act or feel about things in a certain way, because in the end, one of the best ways to heal your insecure attachment is to slowly learn, word by word, the language of having most of your needs met, of connecting to another person, of resolving conflict in a healthy way, of being seen without being put in danger or having to perform, and of expressing emotion without being dismissed or punished for it.
In other words, if you are on the journey of healing your insecure attachment, if you have the means, the best way to start on your journey is by working with someone in a therapeutic relationship on your attachment wounds.
That being said, I know this is very challenging in itself, especially if you’ve been let down by others in the past, but returning to the language analogy, the best way to learn a language is to interact with a native speaker, and the best way to get securely attached is by experiencing secure attachment in real life, in a therapeutic relationship, as opposed to reading about it.