Display currency symbol in WooCommerce product depending on ACF result

I want to switch between two currency symbols on a Woocommerce product depending on what the user selects on a specific ACF field. Site is a real estate catalogue, there is no monetary transactions so I just need to change the symbol before the price.

I need it to display the default "$" or the custom "US$" prefix symbol but I can't make it work. Here is my code:

if ( ! function_exists( 'cambiar_currency_symbol' ) ) {
    function cambiar_currency_symbol( $currency_symbol, $currency ) {
        $currencyfield = get_field('moneda');
      
        if $currencyfield = ('Currency1') {
            switch ( $currency ) {
                $currency_symbol = 'US$'; break;
            } 
        }
        return $currency_symbol;
    }
    add_filter( 'woocommerce_currency_symbol', 'cambiar_currency_symbol', 10, 2 );
}

Any idea what I'm missing?

Solved it by replacing the currency symbol all together with a custom option inside an ACF radio button:

function cambiar_currency_symbol( $currency_symbol, $currency ) {
    $currencyacffield = get_field('moneda');
    switch ( $currency ) {
        case 'USD': $currency_symbol = $currencyacffield; break;
    }
    return $currency_symbol;
}
add_filter( 'woocommerce_currency_symbol', 'cambiar_currency_symbol', 10, 2 );

Tested and working.