Way to many coins for that kind of investment.
Even if one of those coins goes 20x up, you won't even feel it since you have like 3% of your investment in it.
You should definitely lower the number of the coins in your portfolio to up to 5 coins you think might have the best chances (I would probably do up to 3 tbh), and then add more coins as you invest more money or as your portfolio grows (in value).
I know there are many. Those of 1% were my first investments and I was testing the exchanges, wallets, etc.
I do not necessarily agree with what you say about the 20x. If for example my 15 USD of PIVX grow 20x, I would have 300 dollars. I think they would feel pretty in my portfolio.
Nevertheless I know that you are right. I want to get rid of Ripple, BAT and maybe another 2 or 3. The problem is that I have not been able to decide which ones

$300 on $500 investment is great, no argue there, but imagine 20x on $200?
You should not have problems deciding which ones to keep, you basically already decided. Everything that makes 5% or less of your portfolio obviously has to go out, if you believed in it you would have put more.
The other thing you need to sort out with yourself is how risk averse you are.
Do you want a safe portfolio with stable growth? - Go BTC, ETH, NEO.
Do you want a riskier portfolio, but still a stable one? - Go one-two of above and one alt.
Do you wanna go YOLO? Go with 3 alts, the one that still have a good potential for growth and not such big mcap. If I was to choose from your portfolio, I would go LISK, LINK and Vertcoin.
That would be great. i just need to find more money to invest. Im only risking the money i can afford to loose.
I would say im medium term. I dont want the safest portfolio ever but also not YOLO. I like the second option but maybe with some aditional alts.