Use this code
/*
Plugin Name: Remove 'Add to cart' conditionally
Plugin URI:  https://www.damiencarbery.com/2020/03/remove-add-to-cart-conditionally/
Description: Conditionally remove the 'Add to cart' button in WooCommerce.
Author: Damien Carbery
Version: 0.2
*/
class IsPurchasableConditionalFiltering {
    // A reference to an instance of this class.
    private static $instance;
    // Store whether 'Add to cart' button should be displayed.
    private $purchasable;
    // Returns an instance of this class. 
    public static function get_instance() {
        if ( null == self::$instance ) {
            self::$instance = new IsPurchasableConditionalFiltering;
        }
        return self::$instance;
    }
    // Initialize the plugin variables.
    public function __construct() {
        $this->purchasable = array();
        $this->init();
    }
    // Set up WordPress specfic actions.
    public function init() {
        add_filter( 'woocommerce_is_purchasable', array( $this, 'is_purchasable_conditionals' ), 10, 2 );
        add_filter( 'woocommerce_variation_is_purchasable', array( $this, 'variation_is_purchasable_conditionals' ), 10, 2 );
        
        // Remove variations dropdown and 'Add to cart' button for variable products.
        add_action( 'woocommerce_before_single_product_summary', array( $this, 'before_single_product_summary' ) );
    }
    
    
    public function is_purchasable_conditionals( $whether_purchasable, $product ) {
        // Return cached result.
        if ( array_key_exists( $product->get_id(), $this->purchasable ) ) {
            return $this->purchasable[ $product->get_id() ];
        }
        
        // Only do our conditional checks if WooCommerce deems the item to be purchasable.
        if ( $whether_purchasable ) {
            $result = true;  // Default to allowing purchase.
            
            // Check our specific conditions - some examples.
            /* // Product over a certain price.
            if ( $product->get_price() > 2 ) {
                $result = false;
            }*/
            
            // Check if product in a certain categores.
            if ( has_term( array( 'hoodies', 'accessories' ), 'product_cat', $product->get_id() ) ) {
                $result = false;
            }
            
            
            $this->purchasable[ $product->get_id() ] = $result;
        }
        else {
            // Store that this item cannot be purchased.
            $this->purchasable[ $product->get_id() ] = false;
        }
        return $this->purchasable[ $product->get_id() ];
    }
    
    
    public function variation_is_purchasable_conditionals( $whether_purchasable, $product ) {
        return $whether_purchasable;
    }
    
    
    public function before_single_product_summary() {
        $product_id = get_the_ID();
        if ( array_key_exists( $product_id, $this->purchasable ) && !$this->purchasable[ $product_id ] ) {
            remove_action( 'woocommerce_single_variation', 'woocommerce_single_variation_add_to_cart_button', 20 );
            remove_action( 'woocommerce_variable_add_to_cart', 'woocommerce_variable_add_to_cart', 30 ); 
        }
    }
}
$IsPurchasableConditionalFiltering = new IsPurchasableConditionalFiltering;
Reference : https://www.damiencarbery.com/2020/03/remove-add-to-cart-button-conditionally/