As far as I'm aware there aren't any adapters to make an nvme m.2 device function in an m.2 slot that only supports SATA, you could however, get a PCIe card into which you can install an nvme SSD, then plug that into a free PCIe slot on your motherboard. There is still a chance however that your PC won't recognise the device in this configuration, you may need to check the board specification or contact the manufacturer for clarity on this. However, I am not in a position to recommend any such card because it's not something I have had experience with personally.
From what I can see you can still use an M.2 connected drive, just not an NVME one, to that end I'd recommend the 500GB Samsung 860 EVO SATA 2280 M.2 drive. It's a bit older which also makes it reasonably cheap. The 850 is a very reliable drive and should suit you well.
https://www.newegg.com/Product/Product.aspx?Item=N82E16820147677&cm_re=M.2_SATA-_-20-147-677-_-Product
I'd avoid the Pro variants when it comes to SATA configurations because you will never see the increased performance benefits of the Pro series if you need a SATA variant, the SATA interface is just too slow.