I went through my teens with everyone saying to my sister, you too look like twins.
Hmm now today, that is getting comically even closer. But this much is true, my cis female sister, has a nice body and she earned it from being very health conscious.
But you know, even though she can go to the right beach, lose the swim suit and get a salute from any male she walks past, she's still not able to find mr right. And hell, if her looks are not enough.........
Hormones, they might help you get a bit more in your shirt. But keep in mind, nothing in your shirt will make a difference if life just isn't interested in cutting you slack.
Keep trying, but, also , stop thinking it needs to be done soon.
Best looking woman I know currently, was born inside a male form. Do enough work from the neck up, and they won't even be looking at your shirt hehe.