Begin by researching and understanding what myocarditis is.
The damaged heart muscle is not going to get better.
No, you're totally right. It's not going to get better. Sorry Deaf, I meant that more as a rhetorical question, but am operating on too little sleep and no coffee.
I remember seeing reports of kids getting myocarditis and their parents were asking when their kids would be able to resume sports. I would read those stories and think "probably never". If there was any news coverage at all, it usually made zero mention of the seriousness of myocarditis. It was as if it were no big deal, and something that would just clear up. Oh yeah, sure. Billy is going to be right back to track and field as soon as he can get out of bed. That's why I'd like to see a follow up, in a "where are they now?" sort of way. I won't hold my breath, though.