In 2019 I started using Duolingo to brush up my French ahead of an overseas mission trip with out teenagers we had planned for 2020... it never happened as the world changed, but I plodded on, adding in a smattering of Greek, Gaelic and German as well as a few months of Welsh, and a hurtle through the 'math' (arithmetic).  Now, having kept on almost everyday and completing 2000 active days, I have cancelled my subscription and am going to look for a new challenge going forward.  I'm not sure what yet - a break from the relentless daily translation of useless sentences is definitely in order.