@AdamLove "best" with no other constraints or wishlist items is very difficult as there is just so much out there. Most mid-range devices should be a noticeable upgrade, if this is the correct spec sheet for your current phone: https://www.gsmarena.com/lg_k4_(2017)-8489.php. If that's the spec sheet, then the RAM is generous but just about everything else is quite dated: CPU, display, etc.
If you're really looking for overall best and money is no object, most will probably steer you toward the flagship Samsung devices, like the S20/S20 Ultra, or the upcoming Note 20 series. These are very good devices, though I'm not a fan of Samsung's flavour of Android (even though newer ones are generally much improved). If you're partial to LG, you may want to look at the LG Velvet, or the LG V60 with it's cool second screen case.
You could also look at a folding device like the Galaxy Fold or Moto Razr, though make sure you look into the reviews and know what you're getting yourself into. These are flagship-priced devices with quite a few compromises. They're cool though, but probably not a great choice for most. Newer versions of both are coming soon, too.
Another option in the higher end but not quite as ridiculously expensive are the OnePlus 8 Pro (though I think there are supply issues), or perhaps the upcoming Pixel 5 (skip the 4/4XL, though the upcoming 4a might be an option). Huawei make some great hardware but are stuck without Google ecosystem, making them a poor choice for just about anyone at the moment unfortunately.
EDIT: further thoughts... although I'm not a fan of the Samsung world and have avoided them for my own use, they are very good devices overall. And they have a huge benefit over other Android phones, which is 3rd party support. Just about any case manufacturer supports the popular Samsung models, and quickly after the device comes out. And I ran into an issue with my OnePlus device where a relatively new client I've picked up won't let me use most of their services (MS Teams, Outlook, etc) from my phone because it's not on their supported list. This is probably more of a niche problem affecting some BYOD users with some employers, and after a few years of OnePlus loyal usage this is the first time I've been hit by something like that. Annoying, but not enough to sway me (yet). But you can bet that would not be an issue on a Samsung device, or, if you're into it, an iPhone. There again, iPhones are not my thing, but they are a great product that countless many love. I don't personally use either brand but rarely hesitate to recommend either to friends and family when asked.
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