What are 4 ways Labour Party MPs could remove UK PM Keir Starmer?

Several Labour Party MPs who have called for UK PM Keir Starmer's resignation could remove him in four ways, including securing the written support of 20% of Labour Party MPs (currently 81 MPs.) They can exert public pressure on Starmer if several ministers resign together or try to privately pursuade him to resign. MPs can also call a no-confidence vote.