I think I bombed 1 out of the 6 rounds

I’m interviewing for a startup in the Silicon Valley and I think I didn’t do well in the System Design Interview. After the interview they interviewer said that he understands that I don’t have much experience for such complicated system design. I think its good that he understands that and he appreciated my effort but probably still it was not up to the mark. I feel terrible coz I have given 6 rounds already and this one didn’t go well. Idk when will I get a job now. This year has been so terrible for me but I am trying to put myself together and go ahead with life. Seems like everything has just fallen apart in such a short time in both personal and professional life. Hopefully the search ends soon