loopi

[countriesSelect, citiesSelect].forEach((el)=>{
    el.addEventListener('change', () => {
        if ( ) //...
        else //...
    }
})

const paragraph = {
    country: document.querySelector('p .country');
    city: document.querySelector('p .city');
}
//... changeText заменить на соответствующий
paragraph.country.innerHTML = countriesSelect.value;
paragraph.city.innerHTML = citiesSelect.value;