I always got the impression that English was fairly easy to learn, because it’s so international and accessible. But, it’s actually a lot more difficult than I realized having helped people here. They often ask grammar questions that I can‘t answer because I’m a native US English speaker and never studied the grammar. We did in school, but most people never paid all that much attention to it and kept on speaking the way that was natural to them. So, we kind of have to go off of what sounds right and what sounds wrong to us, and I know that’s no help to English learners. Native speakers never „learn“ their first language, they acquire it. Just like you never learn how to see. It grows in their head. Learners of a second language go through a much different process when learning their second language.
You may want to go back to what got you started learning English in the first place and see if you can recapture some of whatever motivated you in the first place. If you can find that again, maybe your motivation will return.
Please just hold on a second and think back why you were so eager to master a language and think about if it is worthy to invest more time and effort on the learning. No doubt there is no standard answer if one persists or not but only the sincere voice deep in your heart mind can tell if you are still worthy to spend time on language learning.