Yes, I know, the search by date range is only of limited use because of the required tag.

to find my posts with a specific title

You could only search by title:

If you scroll down a little, you will find the 5 posts from 2020.

Incidentally, these all contain the tags #creativecoin, #spanish, #relato and #palnet. If you use one of these tags, the search by date will also find it.

But I know, I don't remember tags used years ago that well either.