Multi-Options in Crypto

[mensha]

I am doing crypto related works for around 1 year. I am engaging in this crypto field involving following activities;
1.       Investment on crypto coins including bitcoin
2.       Investment on ICOs
3.       Trading
4.       Buying and Long holding
5.       ICO promoting works like Airdropping and Bounty hunting

Apart from above activities, what are the other crypto related activities that I can contribute and gain some profit out of it? Could someone please list down all other options and give little elaboration on those?