What is the safest way to earn regularly and securely from cryptocurrency?
join bounty campaigns, it is not regular, less secure because you are not guaranteed that you will get your reward after the campaign, but if you do your tasks properly, then you will received your reward equal to the work you did.
There are many ways to earn money in Cryptocurrency, some have previously mentioned joining Bounties and Airdrop which is ideally good if you are lucky.
If you want to have enough money, you have to take risks, investing in ICO is one of the main ways, but it is very capital intensive and requires a lot of Experts who will work with you