Hi and welcome to the forum,
As far as I know, you should get the offer to the update in your MySteinberg account.
Since Cubase 10.5 all LE and AI licenses can always run the latest version of LE and AI, as it is mentioned here, but as far as I can see, this is not your case.
In any case, you can upgrade to Cubase Elements 11. If you do so, you will get Cubase Elements 12, once this will be released this year.