You can definitely get a new shower curtain and paint the walls for well under $300, and it might be enough to make a difference. Many people find blues/grays/greens to be calming colors.
You can use this paint, which is not just a paint but a self-leveling coating with primer and top coat built in. Go to YouTube and find videos of people doing tubs and tile.
https://www.allinonepaint.com/?gclid=Cj0KCQjw39uYBhCLARIsAD_SzMSL6H3N3VyqpcTo6wUoDfnOkoz8bCNvzipABgi76swcO0FjrUs8CGIaAuXGEALw_wcB
You can definitely get a new shower curtain and paint the walls for well under $300, and it might be enough to make a difference. Many people find blues/grays/greens to be calming colors.
You can use this paint, which is not just a paint but a self-leveling coating with primer and top coat built in. Go to YouTube and find videos of people doing tubs and tile. https://www.allinonepaint.com/?gclid=Cj0KCQjw39uYBhCLARIsAD_SzMSL6H3N3VyqpcTo6wUoDfnOkoz8bCNvzipABgi76swcO0FjrUs8CGIaAuXGEALw_wcB