a lots of things are already been provided i guess much better to keep seeking for the things that you are familiar with or the things that get your interest because while holding your bitcoin its already moving make it to grow more would be your decision in which way you choose, trading ,lending ,gambling those are the most common look if what interest you most mate.
There is no need to complicate everything because by simply holding your bitcoins you can already grow the value of your bitcoins but not the number of your bitcoins, the other options need time for you to do it successfully like trading which requires you to be active so you will also be updated.
Holding will give you profits only if price goes higher in future but it will never increase the number count of your coins and if you want to grow them then you should take help from trading.