I don't live alone but do have to cook just for myself for long spells when DH is away for work (can be weeks at a time) and DS is at University.
Like you, I don't want to completely rely on ready meals but I really cba cooking for one and I am pretty tired of cooking even though I'm competent (and a bit of a foodie). So what I do is promise myself I'll cook properly twice a week and make my usual 2 or 3 portions, and either freeze what I don't eat or have it as left overs within the next two days.
I'll have a good quality ready meal from Waitrose or M&S a couple of times, but always with fresh veg or salad or fresh fruit salad afterwards.
Once a week I'll treat myself to a lunch out - a local noodle bar is a favourite - so only have something quick for dinner like egg on toast.
And after that there's always the bare minimum effort quick meals like jacket potatoes, omelettes, pasta pesto, a small quiche and salad, ham egg chips and peas, roasted veg & cous-cous with something like lamb chops or oven baked salmon.
I'd love to never have to cook again though! But I value my health too much to eat rubbish. I hear your dilemma OP.
P.S. I often make home made soup in the winter. We don't have a soup maker, large pan does the job fine.