I have to say the best thing I’ve done is buy a treadmill, but I know I’m very lucky to have the space to be able to do so. I’ve not been to a gym for years because of having a toddler, but I really miss it and I can see how detrimental it can be to have that taken awayI was actually ready to pay £50 for one kettlebell until my nearest gym decided to put some out on loan for us. Like you I need exercise to keep my mental health on an even keel, I’d usually rely on running but it’s not doing it for me right now.
There’s also a couple of Local instructors who have taken to online workouts really well (far more charisma and motivation than Joe wicks!) so that has helped in the absence of an actual gym facility/
sports direct usually have equipment for quite cheap but it might not be as heavy as you need