$15k is a good budget for investing if you choose the right coins. In my opinion, IOTA, Cardano, PKT, Bitclave and TIO is a good portfolio for you. I believe you can get profit if choosing them
nice line up of coins you got there brother, i also have some of the coins you mention although i still need to invest more on some other coins like bitcoin if a have 15 ethers because bitcoin is still the best for investments whether short or for long term. i then leave some ethers in on my etherium wallet in order for me to trade and exchange some of my alttcoins and tokens. overall i still prefer trading when compared to investing because trading is still the best when it comes to earning a profit.
