That's right, you can't combine investing and trading because they're two different things. If beginners start investing in Bitcoin but then decide they're accumulating coins too slowly and want to speed things up with trading, it stops being an investment and becomes trading. Right now, I'd prefer to invest exclusively in Bitcoin, no trading, no altcoins. It might not be the fastest way to get rich, but it's the safest choice, as I won't have to worry about anything happening to my coins tomorrow.
Your accumulation for your investment portfolio must come from buying on the market or mining. It's not right to think that you can increase your bitcoins by trading, get profit from trading to buy more bitcoins. It's purely trading and no longer as an investment practice.
Trading itself is dangerous and most traders lose money, lose bitcoins by trading, so it's super dangerous and wrong to think that you belong to very minority of traders and get trading profit. Imagine that rather than profit, you get loss and will have less bitcoins with time, not more, it is like unwanted damage on your bitcoin portfolio with time.
Don't aim at harder thing, let's do the easier thing, let's invest only. By that you only need to work, get money and use part of your discretionary income for purchasing bitcoins and increasing your portfolio with each purchase round and with time.