It's actually good that you're not familiar with the world of altcoins, and that you only invest in Bitcoin. By doing that you reduce risk, and maybe even make some profit since you buy from the beginning of the year. I think you should focus on investing only in Bitcoin, but maybe 10% of your money can be used to play with altcoins.
When you say x3/x4 price increases, it is true that some coins can go up in value, but most of altcoins in the top 50 are fairly stable and in the short term is not realistic to expect some great jumps. What you can try is that you find some relatively new coin which is very cheap, but it has a good team who will probably pump that coin value. This is very risky trading, and most of those coins have no purpose other than just a pump/dump scheme.
Just look at the following link for an example, but know that none of the listed coins is not my advice for the investment
https://coinmarketcap.com/gainers-losers/