When is it time to remove a tree instead of saving it?

I have a tree in my yard that looks weaker every year. Some branches are dry and the trunk has a few cracks. I’m not sure if this is something a tree care service could treat or if removal is the safer option. How do professionals usually decide when a tree is beyond recovery? Are there clear signs homeowners should watch for before calling a company? I would prefer saving the tree if possible, but safety also matters. Has anyone dealt with a similar situation?

It is always worth trying to save a tree if the roots are still healthy! I noticed my maple looking thin and sickly, so I started deep watering and mulching, which helped a bit. However, if you see fungus growing near the base, that usually means internal rot. I invited julian tree care over to do a quick health assessment. They have special tools to check wood density. Sometimes a good deep-root fertilization can bring them back to life.