We can increase our BTC portfolio doing by investing in the ICOs, buying coins, trading and etc... These are the best ways to increase our portfolio. Personally, I'm always trying to increase my BTC portfolio for my future. BTC is the great currency, So I will give advice to all, collect BTC more, It is a very worthy thing for your future. But At this moment is very very difficult to increase BTC portfolio because the current market is a fully bearish market.