If you want to earn without putting any money from your pocket then you can participate in bounty programs of new ICO's and get their coins as per your work share. If you want to add some money then buy BTC and do trading of altcoins through your bitcoin and get them.
No one can predict this market but this market have huge growth potential and now the market start its upward journey. If i am in same situation then i will hold for more profits as market is just started its upward journey after a long break and we will see good rise from this point in coming months.
I am fully comfort with my bounty coins and hold them as i know the huge potential of this market and we will see many coins hit their new all time highs in next bull run whose signs are showing with bitcoin start rising after a long haul.
Cardano is a solid coin but cannot beat bitcoin as no coin can achieve the trust equivalent to bitcoin because bitcoin proves its strength in last 10 years and every crypto investor always go for bitcoin as his first preference of investment.