For me, I will go with one and two which is holding and staking, and this is because trading and employment as the poster called it hasnt worked for me, I've traded for some time but I never got any good results from it, for the employment part, I've never applied to get employed in any crypto company so that part is one I've never taken part in, so the two or three effective ways I've been able to earn from crypto is through buying and holding of coins, staking them for interest and the third one which I believe the poster forgot to add is bounty and airdrop, I've earned some tangible amount from bounty in the past.