You can convert it to bitcoin if you do not like to invest in an altcoin. Besides that, BNB itself is a good coin so why should I sell it and invest in the other coins while BNB has a good chance to increase higher. When you convert your BNB to Bitcoin, you have the best investment and you do not have to invest in the other altcoin. So that will be up to you, whether you still want to invest in altcoin or bitcoin.
binance coin or bitcoin have good future for long term investment. if we lookprice history bnb or bitcoin year by year, its give us huge return. both of them as main cryptocurrency have utility in crypto ecosystem ,so demand will always there to attract price.
As a newbie, its difficult to invest into altcoins as you have to study more and more before investment. There BTC is best but as unpredictable market, you have to invest in low price otherwise it can anytime down and same as up. On the other hand you can also choose some blockchain alt coin for investment that can hit anytime any market.
i think there is no difficulties if we want to invest in altcoin , alot online research provided for investors. only pick best of them and focus on our goal for long term so we would not influence prive volatility in daily.