2
Please add this code in your file. Youo will get what you want
$currentGroupId = $this->_customerSession->getCustomer()->getGroupId();
$_salesRulecollectionByCustomerGroup = $this->_salesRuleCollectionFactory->create()->addCustomerGroupFilter($currentGroupId);
$collection = $this->_customerGroupCollection->load($...
2
In your block constructor inject
\Magento\SalesRule\Model\ResourceModel\Rule\CollectionFactory $salesRuleCollectionFactory,
and then filter the sales rules collection by customer group id
$_salesRulecollectionByCustomerGroup = $this->_salesRuleCollectionFactory->create()->addCustomerGroupFilter($currentGroupId);
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