If you want to not only work your heart but want to build muscle continue with your exercise routine and add in some weights.
If you can’t finish a sentence while doing your workout you are going at it too hard. If you are having no trouble talking step it up. You need a minimum of 20 minutes of continued elevated pulse to get the best results at least 3 times a week. If you find you are super tired or unusually sore back off the intensity or take an extra recovery day. The goal is to feel better not overdue.