every cryptocurrency has its own strength and weakness which may lead to its succeeding point. in short every currency has its goal to succeed in their design there is no best cryptocurrency to invest in because it has its own season to level up.
You are lucky that you have so many coin but still you are earning good amount of profit, according to me it is not good to sprinkle your money in various coin, so better to choose one and invest, my choice for now is bitcoin because it has higher profit, low expenses and it gives free money earning facilities only with increasing your knowledge about crypto currency investment, by joining bounty or signature campaign.