I agree: if you're not computer-savvy - for example, you wouldn't know how to back up your data, or to move it (and install whatever software you use) to another computer - yes, you should plan to move to Windows 11 (which may include buying a new computer if you're unlucky): though don't panic, Windows 10 will not suddenly stop working on The Day. But, since even as an experienced computer user, I wouldn't even consider the upgrade without having backed up, in case anything went wrong, I'd say learning how to do a backup, or getting whoever helps you with such things (child/grandchild/whoever) to do so, is much more important: you should be doing that frequently anyway, as disasters can happen any time: hardware failure (probably hard drive or SSD most likely), or you make an edit you can't (or don't know how to) recover from, such as accidentally deleting a chunk of your tree.
I would say implementing a backup regime - at what intervals, only you can decide, but I'd say definitely no less than monthly - if you haven't already done so, is more important than worrying about the end of support of Windows 10. (Arguably, it obviates the need to even do so at all, but if you wouldn't know how to use [restore from] your backup in the event of a disaster - i.e. you'd have to seek help to do even that - then having to do that at the same time as learning a new machine is probably best avoided, so getting the W11 plan in place is not a bad idea. [Since I would be quite happy with the process of restoring from my backup, I don't have any W11 plans,])
For what it's worth, I back up my entire genealogy data once a week to a memory stick (and my emails to another one), and my entire computer once a month to an external hard drive (which I really ought to be keeping at another address, though currently I'm just keeping it - and the memory sticks - at the other end of my home). Since I use something which only adds to the backup anything that has changed (which the vast majority hasn't, such as document scans and other images, for my genealogical backup), the backup doesn't take long. (I use FreeFileSync [which as the name implies is free], but there are several such utilities.)
Oh, one final thing: do check - with other users of it, or a newsgroup, or the makers, or a forum (such as this one!) - that whatever software you're using will actually run under Windows 11. I'd be very surprised if anything that runs under 10 won't run under 11, but you never know. If you don't know what software you're using, ask your helper. It is possible - in my opinion undesirable, but that's a whole different discussion - that you're keeping your entire data remotely, such as at Ancestry or similar (i. e. you always access it via a browser, such as Edge, Chrome, Firefox, Opera, etcetera); in that case, neither backups nor Windows 11 are of great concern to you. The same applies if you're not using a Windows machine at all - you're using a Mac, or Linux - though in those cases you should still be doing backups, unless again you're only using them as a terminal to Ancestry or whoever.