with 0.03btc I have done 0.1 in 3 months, and I no longer count the projects where I have invested and which I find when it climbs dry, there is more money in altcoin to do than with bitcoin himself .. example beast, I take 0.1 btc of dogecoin, I can play all day martingale roulette and seen the sum in dogecoin token I assure you that by playing that by 10 dodge in a few hours you make your $ 100 of profit ... with btc these more complicated .... then when btc and go up from $ 1000 to $ 20,000, how much do we make the other altcoin? much more than btc, just need to be interested in the right project or if it wants to remain profitable while waiting for the rise of the btc which plays martingale and any matter when the btc explodes, the dodge will also explode, so for me btc is not not the most profitable in the long run this and my opinion

Your point is valid though who knows how many percentage bitcoin will able to bring after the halving time. If OP is not in rush and willing to undergo
to learning process inside this industry, holding bitcoin have a lesser risk unlike with alts that in a short span of time you can lose up to 50% or more  of your  initial investment.