async unblock() {
        if(this.isGroup) return false;

        await this.client.pupPage.evaluate(async (contactId) => {
            const contact = window.Store.Contact.get(contactId);
            await window.Store.BlockContact.unblockContact(contact);
        }, this.id._serialized);

        this.isBlocked = false;
        return true;
    }
Unblocks this contact from WhatsApp
@returns {Promise<boolean>}