A lot of depends on potential of the coin and how useful it is.
Cryptocurrency is very volatile. It is good for trading.
But for long term investment coin must be useful.
It is necessary to evaluate the future potential of the coin.
Now there is a big demand in nature protection, that is why the project that protects the planet from pollution like this
https://twitter.com/liquidearth_nft/status/1502269439785541633 has a good potential for investment.
The fall of the market is a good reason to buy tokens. Now a lot of new tokens appear and it is necessary to carefully monitor the market to find the best projects for investment.
You will get the maximum profit if you will invest on the seed or pre-sale stages of token sale.