When you DO the big upgrade, treat it an investment it is. Factor in the ownership costs like repairs. If one device is unrepairable but cheaper and the other one is easily repairable with parts available, but the price tag is higher, take the latter one, for it is truly the cheaper option: it will last you a good while.
Use FOSS. In fact, default to it. You don't need to necessarily become a Stallmanite, use the right tool for the job, sure, but if you aren't giving a FOSS solution an honest try before resorting to proprietary products, you're doing yourself a great disservice by robbing yourself of choice. Trust me, you'll be amazed with things you can do and how much of your needs you can cover with just about any modern GNU/Linux distro. I've come to use it almost exclusively. And it's free! And it's hackable! It just takes some getting used to.
So there! Keep your devices like a pirate would keep their weapons (in a way, they are) - ready, well-maintained, loved and customized by you, and out of the landfill. They will thank you in ways you don't expect. I still have home surveillance built out of old netbook motherboards running somewhere. Also, your cash jar (or bank account, or crypto wallet, if you're into that sort of thing, I don't judge - have to survive on it myself, because of where I live) will look happier. And you'll also at least won't perpetuate slavery and environmental neglect as much. Which is, you know, just a right thing to do.
A lot of people around the world suffered both physically, intellectually and mentally, for the benefit of you watching cat videos on your phone. Show them some respect.
So there! Keep your devices like a pirate would keep their weapons (in a way, they are) - ready, well-maintained, loved and customized by you, and out of the landfill. They will thank you in ways you don't expect. I still have home surveillance built out of old netbook motherboards running somewhere. Also, your cash jar (or bank account, or crypto wallet, if you're into that sort of thing, I don't judge - have to survive on it myself, because of where I live) will look happier. And you'll also at...