You could improve it a lot by upping brightness, then contrast to fill it out -but this won’t solve it. The background is better defined than the actors.

Using a powerful flood (bounced - ie, pointed 45 degrees up to a white ceiling) in small room interiors can make a big difference.

Weaker lights can be thrown directly onto your actors, but only if you put a diffuser in front, like semi-translucent paper. Be careful of hot lamps!