Btw you don't need to find a new OS but can either reflash the current version of Raspbian (Buster, that's two major versions never) or upgrade the distribution by changing the apt list suite. I would recommend a fresh flash but the following might work fine as well, depending a bid on amount and type of packages you've installed:
sed -i 's/jessie/buster/' /etc/apt/sources.list{,.d/*.list}
apt update
apt upgrade
apt full-upgrade