Whatever methods you would have discussed above. I consider myself to follow these things to grow my bitcoins.
1. Convert a small part of my paycheck to buy bitcoin.
2. Use that bitcoin to buy well analyzed low priced and profitable altcoin. Sell it when it doubles or trading in a decent profit.
3. Repeat the same steps whenever you receive paycheck.
4. If you're careful in trading with altcoins it will grow gradually.
Your method is somehow can make your coisn grow except for number 4. If you are buying why take a risk to trade with those shitcoins. Learn the art of buy and sell method in bitcoin and USD and it's must profitable than altcoin trading.