How do I convince someone I am better at the same job in another company?

I don't even know if I'd get a call back from an interview but I'm basically applying for my same job in the same industry for another company.

I'm an office assistant for a law firm.

When I first started I liked it.

I was photocopying, binding, scanning documents and helping secretaries with their work.

I am reception cover 90% of the time as our 2 main idiot receptionists always call in sick every week. I'm. also lifting heavy archived Recall boxes about 60 boxes a week.

Which has now given me shoulder and ankle issues.

The job I'm applying for is pretty much the same but there will be no lifting boxes.

Due to the receptionists calling in sick, the lawyers took all the binding and secretary work off me to give to the receptionist. No idea why, as one of them was never here.

I'm just constantly doing the receptionists work cause they're lazy to do it themselves.

I've asked if I could get more secretary work and a payrise for doing their cover and they just say no. So why should I stay here?

The new company is offering growth opportunities.

Does this sound OK?

I have enjoyed my time here and looking for a role that can grow into other opportunities in the firm.

Thank you

How do I convince someone I am better at the same job in another company?
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