I want to know what’s your do over plan in case you have a chance to do it. Will you invest on altcoins or you will just focus on Bitcoin investment including mining.
If I have the chance to do life all over again, I already have the blueprint for success, so I already know the what and when to invest. Now about your question about which to invest in, either Bitcoins or altcoins, The mistake many people made earlier was having divided attention. If the attention of many had been on specifically Bitcoin ignoring any distraction that may come from the prospects of investing in an altcoin, they would have made significant progress i life by now.
Not to mention, there are still some potential altcoins at the present, but when ask when will you be profitable, the answer will be more uncertain. So focusing on bitcoin instead is a great idea, not only you will secure your profits more certain, but you will also have bigger opportunities to gain huge profits even just by hodling alone and only sell your coins after 10-15 years. That should be my plan if ever, and not just selling bitcoin in just a year or two as it could only mean limiting your profits.