There's a long history but in brief: I worked at (non-career-type) jobs for about 10 years, earning minimum wage or a little over that, contributing to our household with my partner who was much more "entrepreneurial" than I am, and she actively enjoyed working, but most of that time she was just working for other employers as well (but earning significantly more than I was due to a combination of education/interview skills/general aptitude for the workplace).
About 7 years ago it became clear that we were in a financial place where she was earning 90% of the household income and started out independently with her own business, with increasing success (compared to working for an employer). We jointly made the decision that I would resign from my job (which I did, and was relieved to do so!) and for those years she worked at the business and I got a lot of "leisure" time to work on my own projects (which don't translate into marketable skills) and just take it easy as a "kept" partner. (We don't have children) I did take on most of the responsibility for the housework but as a couple without children and with my partner out of the house most of the day, there wasn't much that needed doing -- maybe an hour a day.
This month the situation has changed dramatically and I won't go into the details but in brief: now I need to go back into the workplace and presumably start at the beginning, and get a job doing whatever I can do.
Truth be told... I don't want to go back to work. I'm resentful. I can't speak about why I'm "passionate" about this or that job, or why I really want to get into this role, because the truth is.. I don't want to, but now I need the money. I have been out of the workplace for 7 years and have no real achievements to show in that time (I didn't take time out to develop my skills, work for myself, or whatever... it's just that I didn't need to work any more!) -- When I resigned 7 years ago it was like I was retiring, but not old enough to claim a pension just yet.
How can I present 7 years of (ostensibly) a "life of leisure", being a "kept man/woman" on a cover letter, resume etc -- and how can I get across any kind of enthusiasm of "I really want this role because..." to an employer when the truth is I didn't need to work, I didn't want to work, but now I do need to (but resent it) and it's just a means to an end?! Especially as "why did you leave your last employer" isn't a rosy tale. My honest answer is "I couldn't take it any more as it was doing a number on my mental health, and I realized I didn't need to".
Edit in reply to comment: I was working in factory and warehouse type jobs previously, and that's probably the same type of work I need to pursue now.