From my own experience this is a better strategy than trading.
Except I would make 1 change to your plan.. instead of just investing randomly in the top 30 coins, narrow it down a little bit. Pretty much everything in the top 30 currently will go up by a lot in a year from now, but some may go up more than others.
These days, I only buy to hodl for atleast 6 months.
Yes I plan on narrowing it down based facts about the coin, and ones that hold a bit more promise then others. Should be a fun adventure!