I would personally invest 95% of it into various solid investments and turn the 300 million into 3 billion over 10 years
Also, I would start my own charity helping victims of child abuse and run away's by opening up places for shelter, education, healthcare and nutrition's for vicitims of abuse in my own city. Also, I would Lobby to get a Law passed to allow authorities to Castrate any sexual predator's and shove it down their own throats.
If a case involve's a JW sexual predator, they will get the same but also get their Head shoved up their arse as an added bonus.
And who says money can't buy happiness?