Cloudflare, MicroStrategy, and Arm could still be millionaire-maker stocks.Many investors consider 1millioninsavingstobeasolidbenchmarktoreachbyretirementage.Andyet,accordingtothelatestdatafromtheFederalReserve,Americanretireesbetweentheagesof65and74haveaccumulatedamediannesteggofjust409,900.A lot of Americans are falling short of that million-dollar mark because they didn't invest enough of their savings in ways that grew the principal significantly. Over the pas ...