How much is it going to take?

My dad got me this iMac late 2013 21 inch 16GB ram and a 64GB usb with it,now i tried uninstalling tahoe but i ended up with mountain lion so After 2 months of work i installed high sierra, its been stuck at 0mb for like 20 minutes? I need ventura for editing apps,some games like roblox and other and for messaging because already Catalina 10.15.7 is almost not supported anymore with apps so i decided to install ventura