Google cloud interview experience

Recently given google interview for L5 position in india. Recruiter scheduled 3 coding rounds. I solved 2 problems in first round related to graph. In second round I could not come up with equation , but after getting hints I could solve 1 coding problem only. In third round I solved 2 coding problems. questions are on tree traversal side. I called recruiter, and I got feedback for 1st and 3rd rounds. For 1st round it is LH Lean Hire. I don’t know what else interviewer needs. I solved 2 graph problems but still LH. For 3rd round, it is LNH. Lean No hire. Got feedback that I should create add functions in classes. but logic is correct. I don’t think it leads to LNH. At least it should be LH. For the 2nd round, waiting for the feedback. please suggest my chances for google. I can accept L4 level as well. Any suggestion that I can give to recruiters to boost my chances for L4.