Here we can get cart rule from quote, so we can apply cart rule based on quote

This is making module : Magemonkeys/Generalcart

This is block file

<?php
namespace MagemonkeysGeneralcartBlock;

class Simplequote extends MagentoFrameworkViewElementTemplate
{
    protected $sessionmodelFactory;
	protected $quotemodelFactory;

    public function __construct(
        MagentoFrameworkViewElementTemplateContext $context,
        MagentoCheckoutModelSessionFactory $sessionmodelFactory,
        MagentoQuoteModelQuoteFactory $quotemodelFactory,
        array $data = []
    ) {
        $this->sessionFactory = $sessionmodelFactory;
        $this->quoteFactory = $quotemodelFactory;
        parent::__construct($context, $data);
    }

    public function getAppliedIdsforrule()
    {
        $quoteId = $this->sessionFactory->create()->getQuote()->getId();
        $quote = $this->quoteFactory->create()->loadActive($quoteId);
        $salesruleIds = explode(',', $quote->getAppliedRuleIds());
        return $salesruleIds;
    }
}

we can call this getAppliedIdsforrule() function in block
so its return rule ids.