The right time to buy coins also affects your results. The right time when market conditions decline and you can invest. Then you can decide which coin you want to buy. I recommend buying coins that have large volumes, such as Ethereum, Binance Coin, Litecoin and EOS.
Try now to monitor the exchanges and all the conditions of the red coin. It is better to buy coins soon.
I also think that I should invest early because the demand for investment has been increasing very well in the past few months and if everyone has great confidence, I am sure this market will have a high price increase soon. Now there are lots of options in this market and if you trust one of the top coins you should plan to invest now because the current price is very cheap compared to last year and it is completely possible to get good profit
it's good to invest in top coins, but at least invest in some altcoins, but not too much as the OP said. I think besides bitcoin we can invest in ethereum, binance, litecoin. That altcoin is my favorite altcoin.
especially with minimal funds, if investing in lots of altcoin will increase the required fee