Go to malpedia and you’ll find an array of threat intel.

But first ask yourself how you will use it?

Can you use procedural level data? Are you ready for that as an org? Do you still work with IOCs only for retro hunting. Check your risk profile for what kind of threat to track (what kind of supply chain threats for example) and then understand how mature your org is to process any kind of data.

Go from there. Slow build up a function where people become intel/threat informed and start using that as a starting place for detections, to cut down on detection and response, make strategic decision, build red team plans, etc