How to help a cracked tooth you had a root canal on?

I had a root canal years ago and it was successful but I never was able to get a crown over it like the dentists always suggested. A few months ago I could tell it started chipping and one moment I felt a crack when I was eating. For the last 3 months I haven’t been eating on that side to prevent anymore damage or cause more stress to it. I plan on getting a crown around tax season when I can actually afford one but I want to know is there anything I can do to help it before I am able make it to the dentist?
How to help a cracked tooth you had a root canal on?
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