This is an issue that some restaurants go through at certain points. The trick is to deal with this in a positive fashion. Hiring your staff is kind of like buying kitchen supplies. You should only be investing in the ones that will keep your business in the black. You should only be investing in the ones that will help your business, not hurt it.
Say you are working with a kitchen utensil and it has stopped working. What do you do? You get rid of it and invest in a utensil that will help your recipes flourish. Same goes for the people you hire.
There is no sense in hiring a staff that is going to hold you back. There is no need to hire a staff that doesn’t care about you and your message. The point is to get rid of the bad apples in the bunch.
If certain members of your staff are not pulling their weight, you need to get rid of them. It will only hurt your business more if you keep them on board. Same goes for keeping old supplies that are not working. You are basically hitting your head against a brick wall.
It might cause some friction in the short-term, but you need to think long-term here. in the long-term you will be glad you move forward without the utensils.
The point is to treat the hiring process like your kitchen supplies. You need to be thinking long-term. Invest only in higher-quality staff and products. It’s the only way to get the most return on your investment.