Create a new user profile for work
If the browser method still isn’t working for you, it may be a good idea to make a new work-only user profile that only allows you to access the core programs and websites you need to get your jobs done.
Make the most of airplane mode
Airplane mode is great if you are easily distracted by push notifications as it eliminates these whilst turned on. It also blocks internet access so is a useful tool if you are able to work whilst disconnected. If you require internet access, you will probably need to find a different solution.