Annulment of Vows Regarding the Observance of the Sanctity of the Sabbatical Year

I am an elderly woman who moved to Bnei Brak several decades ago. My late husband took upon himself to observe the sanctity of the Sabbatical year when dealing with fruits produced by non-Jews. But today I find it difficult, with all the chaos that’s going on, to remember to observe it and to put it in special Sabbatical year bin, and my grandchildren tell me to perform an annulment of vows. What does the Rabbi say?

Greetings,
Generally, the sanctity of the Sabbatical year, as far as non-Jewish produce is concerned, is divided into two: the actual observance of the sanctity, and various stringencies that are very worthwhile to observe. But if you are elderly and it is very difficult, it is possible to perform an annulment of vows.
According to the basic law, there are almost no non-Jewish fruits today, this mainly applies to fruits and also to squash; besides this everything else is mostly already harvested in the eighth year.
And even in things that have sanctity, the main thing is not to throw directly into the bin food that is still fit for most people to eat.
For example, you cooked some squash, and it remains in the pot, but you will no longer eat and it is not expected that the grandchildren will come, but the food is still fit to eat, put it in a bag in the Sabbatical year bin, or leave the food in the pot until it spoils a bit.
But regarding peels or leftovers that you used to be stringent with, which most people will no longer eat, an annulment of vows is sufficient, and there is no need to worry that this food is still fit for an animal.
And also, you should not change the way you normally cook, for example, to prepare this food according to an original and strange recipe, which changes the way the dish is normally consumed. For example, an orange is usually eaten raw, or cooked with chicken and the like, but it is not the way to bake it as an orange cake with orange slices. It is permissible to bake a cake with orange juice.

Chazon Ish (Shvi'it, Chapter 3; Chapter 20).