I have not logged in for months. I want to log in again.
I am told there is no data and Trello suggest me to create an account. Does that mean that all old data is gone?
This typically means that the email address that you're trying to use to log in is not the same email address that is associated with your Trello account. Do you have a different email address you could try logging in with? If you tried with a personal address, could you try a work address instead, or vice versa?
Probably not.
From what you're saying ("Trello suggests to create an account") it seems you're not logged in yet?
Where did it tell you there is "no data" and what does that mean?
Because if you typed in an email address to try and login, and the system doesn't recognize it, the site would show you something like this, urging you to create an account
To save time, perhaps try resetting and see what inbox receives that mail and take it from there?
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