Newly added Plugins not working

Everytime I put new plugins in the folder and enable them through the software, it does nothing. And I do not know why this is happening, please help.

Which plug-ins?
Which version of Audacity?

version 2.1.2 plugs from era. They worked before, not sure what is wrong now.

Audacity 2.1.2 is very old. You may want to consider updating to the current Audacity 2.3.3, which is available via the Audacity website:

The plug-ins listed on the ERA website are 64-bit plug-ins. Audacity currently only supports 32-bit plug-ins (64-bit support is on it’s way, but not here yet).

Alright, but will I lose my projects if I do so?

Audacity 2.3.3 can open earlier Audacity projects.