The best way is to invest in a profitable ICO and flip your profit into anothe profitable ICO just imagine that the first ICO you make 3X of your money and the second you make 3X of your money your 1BTC has been turned to 9BTC
is this just an imagine or you did this by yourself and then telling others? investing 1BTC into an unknown ICO is not a smart way. there is lots of way need to consider and confirm before investing your money.
I would never suggest to invest 1 bitcoin in one ICO. if you have 1 bitcoin you can invest in 4 ICOs at same time..