I used to speculate low cap alts on Cryptopia and Yobit as they have high volatility which is good for quick trade. For long term hodl, i advise you not to invest in them as low cap altcoins are easily to be manipulated but there are also some hidden gems that will bring you high profit which is hard to find. I remember when Egretia only had low market cap but now they're in top 100 cmc.