I have the same sorts of challenges you have. My way of solving it wasnt to do the complete opposite and go into the office. WFH 99-100% is a blessing. Regarding feeling sad/isolated - whatever - you need to find ways to combat this. The way I did this was starting a meetup group - so on time Im not working I can be running events with others primarily nights/weekends. This has helped me tremendously. I additionally will spend say friday afternoon at a local coffee shop. Hope this helps