Try Out Anti-Fog Lenses
This is not a quick fix but you can buy purchase lenses that have an anti-fog coating and this could be the product you need to fix the fogging issue. And even once the pandemic is over and masks won’t be needed anymore, you may need it in case your vision could be obstructed by something else.
One of those seven tactics should help fix the fogging issue with your glasses. Good luck with it!