While it’s true that the changes to the Liturgical Calendar reduced the number of Marian feasts from 21 to 14 and three of the feasts were dropped, the Feast of the Expectation wasn’t affected by that. Here’s a list of the feasts before and after the changes in support of my statement. Feast of the Expectation isn’t even mentioned in either list.
https://udayton.edu/imri/mary/l/liturgical-history-of-marian-feasts.php
It’s my understanding that the Feast of the Expectation was only ever observed in some European countries. It started in Toledo, Spain in the 600s, and spread to a number of countries in Europe. It appears to have always been a local calendar feast and is still observed in Spain, Portugal, Poland and some other places.
You can certainly observe the feast yourself by praying the Collect, which Liturgia Latina has provided:
I do this for a lot of feasts that aren’t in the current US calendar or that are optional memorials and the priest chooses to say the regular Mass for the day instead.
Also, those prayers to Our Lady of Expectation are often said outside of the feast day itself. I have seen that icon you posted as a prayer card with the prayers on the back, it’s in a lot of churches.
Unfortunately there is going to always be some tension between those of us who think that Marian feasts are great and others who think that it’s too much emphasis on Mary, or even have some other problem such as it complicates the chant for the day (we just had a person on another thread complaining about Marian feast days because of that reason).