60's construction
Added insulation
No radiant barrier
Soffit vents but no ridge vents

Would solar attic fans be a great idea?

Sorry, most all experts agree NO - there's just NOT enough SF - nor CFM w/fans to do the job 'till they wear out ...
but all say YES to passive ridge vents ASAP + expand soffit venting according to calculations.

Yes they even have vents for hip rafters for hip roofs with little to offer at ridge.

https://rebrand.ly/cdcqkgx