First question, what CPU is in your laptop? If it is Intel 12 or 13 gen with P-cores and E-cores, it is a bad idea to switch back to Windows 10, because it can't switch processes between P and E cores when needed, so you will lose a chunk of performance and battery life.
If you have an AMD system (or Intel gen 11 or older) you can go to https://www.microsoft.com/th-th/software-download/windows10
Create a USB-stick with Windows 10 and install it from scratch.
Then you can go to eBay and get Windows 10 Pro key for $3-15 (those keys are in a grey area, they are legit and working, but using them for your system can be considered piracy, do not use them for OS if you want to use it for commercial purposes)