I have a growing number of coins i have earned from this site Stellar Lumens, WNOBT, Byteballs, Flash.
For airdrops many you need to be a junior member on bitcointalk and for others you need to be a bitcoin holder so please be aware of the requirements for each one and whether you qualify.
My advice is you may be best off doing small jobs on bounty campaigns: creating a white paper, translating the ANN and getting paid in the new coin that is being promoted. best of luck in your investing and asset accumulation.
An example to this is DeepOnion but i think you should be al least Jr Member and doing some stuff , check the Ann