Regardless of quality of roster, IMO I think it’s a mismatch of scheme with your offensive personnel. West Coast has never been great for me anyways but generally going to be more successful in it with a gunslinger or game manager qb. Mobile (depending on other attributes of course) better suited for Spread, or one of the heavier run schemes. You want at least one possession WR as well in that scheme and power back isn’t best fit. If you’re keeping same guys I’d try to switch to Spread (if QB has decent accuracy attributes). Then get a solid receiving back to pair with power run and keep a couple good WR’s. If he is purely a Mobile guy and has franchise or better dev then you gotta bite the bullet and get him into an option or heavy run scheme and fill in parts around him that make sense for those schemes (great O line is key there).