Note that each phone have specific update policy, for example your phone was eligible for 3 years of software updates only (and it already ended) and the same goes for every galaxy A phone from the A1x to the A2x and the A31 and M series, f series phones, then In 2022 Samsung updated their update policy to 4 years for the A52 and newer and A32 (I think, maybe from the a33 and newer) and to the S Series, and just recently the s24 series (and future products from the s series ) will get 7 years of update
Consider buying a A3x phone if you want the latest software, witch I recommend as it secured your phone while providing a lot of features, or if you can buy an s24 so you can enjoy it for at least 5 to 6 years
