I hope you still need this help or that you successfully solved the issue.
leave everything at default values in the performance tab in corona, these don't have an effect on realism in most cases and are optimal by default. except for one value, change the secondary solver from UHD Cache to Path Tracing (also not a rule, it's only because your scene is an exterior setup).
keep the sun intensity at 1.0 and just play with the size. you can use an HDRi instead of the corona sun&sky for better colors and reflections. try HDRI Haven all their HDRi's are free and high quality.
As for the Tone Mapping in the VFB, for an exterior setup especially like yours, I wouldn't go above 2 for highlights compression.
hopefully, this will work, follow me please, leave the exposure at 0 for now.
increase the contrast to a high value something like 5 or 6 you could even try 7 some interior shots can take 9!!
now the curve: pull the midtones up like the image below.
now go back to the exposure and bring it down until the image looks right to you.
now back to the contrast be brave there lower and raise it as you like given the guidelines above.
again go back to the curves and find a midtones value that works for you.
it's a cycle with the contrast being the most important value that USUALLY shouldn't change for one angle.
take the image in 16bit tiff to photoshop and play with cameraraw to your heart's content
these settings are NOT the best, there are better ways but this is a quick way for you to get your job done.