A lot depends how useful are the coins that are in your portfolio.
To grow in price the coin must be useful and in demand.
Now airdrops are popular and there are products that allow to make airdrops more simple like this https://twitter.com/Artikfinance/status/1500098076035407875
Cryptocurrency allow to earn money and offer a lot of useful for people opportunities. That is why it is so popular and in demand.
The more people use crytpocurrency the more adoption of it.
Investments in new projects require to have money for investments to buy tokens.
But it is possible to get tokens without investing. That is why airdrops are so popular.