As you mentioned A-UPRT, it sounds like you come from the EASA lands. Either of your options has its peculiarities.
For instructing, you have to be quite sure that the school where you do your FI will give you a job afterwards. Someone with as significant GA experience as you has fairly good chances and will definitely be prioritised over a 200-hour CPL graduate who couldn't think of anything else to do. However, make sure that the financial arrangements make it more or less survivable. Many, if not most instructors in Europe are only paid by the hour. Which means that a month of bad weather and/or low demand for lessons leaves you without any income.
For airlines, it's certainly not the best time. Recruitment these days is mostly limited to type-rated pilots - and even then, there are far more applicants than jobs. And it's likely that at some places retrenchment is still not over and done with.
Something that could be a good opportunity is corporate aviation. Relatively unaffected by corona and often prioritising pilots from a GA background over former airline guys. However, most jobs there never get advertised. And the good ones are distributed by referral only. Nonetheless, having a word with your local business jet operators certainly wouldn't hurt.
Best of luck!