Roll20 will cut out the alt-tabbing middleman and let you run your D&D and TTRPG games directly in Discord, which you were probably using for voice chat anyway

If you play D&D online, there's a chance you use—or have used—Roll20. While it's far from the most versatile or powerful virtual tabletop (VTT) on the market (with others having far more extensive modding and addon support) it's both free and straightforward enough to use that I feel its popularity is deserved. You also probably haven't used its integrated voice chat system.

Whether it's improved since the last time I tried to use it or not, the fact remains that there are just better options.