Re: The most profitable ways to earn cryptocurrency?

What are the most profitable ways to earn cryptocurrency in 2021?

In the Beginners & Help section you have a very old topic that, I think, is still valid today: [General] How to earn Bitcoins

There are a few ways to earn Bitcoins, which differ in both skill and effort. A few things you can try:

Offer your services in the Service-subboard
Join a signature campaign (be sure to read the official forum rules before joining one)
Sells goods (Physical or Digital)
Trading altcoins (be sure to read A warning about Alt-Coins)
Mining (see also How Bitcoin mining works)
Invest (but don't be stupid)
How to Buy Bitcoin?

Generally, the most profitable way to earn cryptocurrency is the same as earning any other currency.