I don't know if it happened to you buy it's happening to me and some friends I talked to.
I used to perform quite well in lockdown but for some weeks I've been sucking and sucking.
For instance , 1 v 4ing was for me a pleasure and a challenge I was proud of when Isucceeded but now I may not be able to beat only 1 player( that may be not particulary good).
I don't know if it's rustiness, ( I didnt stop playing though) but even if I try, I still can't do much.
So, if you have some advices or experiences of this, please tell us ( I'm not the only one in the case).
Well, knowing how well you play LD, I think you'd be the best person for determining what you're doing wrong. I suppose us others could help, but I think we'd need more info. You aren't saying much other than that you feel like you've gotten worse at LD.
Analyse your fights, think about your errors, and try to not repeat them to improve. That's what you always should do, whether you're a newbie, a pro, or someone in your situation.