Struggling with this unrelenting constant cycle

Although I was diagnosed approx 15 or so years ago, it’s only been in recent years that I’ve found a good team of professionals and experts to offer support, advice & care.
These last 8 months have been so challenging as I’ve found I’ll have worrying manic times for a week or two then fall into a depression, in bed, sleeping for days on end. Then the cycle continues.
I definitely feel that my sleep & work commitments are contributing.
I work part time, though long hours & early starts. I’ve started studying also.
The mania I can just manage (I’m medicated but generally stop when I’m depressed, which I know doesn’t help either) I’m so productive... it’s great especially when I think of all the days I’ve been in bed.
It’s the depression that I find challenging, overcoming that, finding the will to make that first step, that first movement out of bed...out of the house.
I’ve attempted various things, I don’t have a strong social circle, I’ll attend activities in the community and attempt to have things to look forward to. I’m creative and will often have projects I’m working on, but even so that’s not enough of a motivatior at times.
A walking group or something like that would be great, but I haven’t had much luck in the area.
I generally function, managing to attend work etc but this week for the first time in ages I missed school & work.
So I guess I’m looking for suggestions...

I’ve hoped to attend a support group but haven’t been able to with work commitments...hopefully in the future

Thanks in advance