It is a big risk to go all in.
How much you have to invest is not really important for that decision, you should always diversify a bit even if you start with $50.
I suggest you to split in 3, for something a bit safe $200 in BTC then $150 in 2 others projects.
or you can try something like this :
$200 in BTC
$150 in STRAT
$75 in an other project
$75 in an other project
Nah, diversification should start if you have 1.000$+ to spend currently...
Its no point throwing a couple of $ in each coin...
around 300$ should be the lowest investment in a coin... that way atleast you make 300$ if it doubles... making 50$, is better of working for it