Meta interview experience: E4/E5

Hello everyone,

I recently completed my full loop interview rounds with Meta. I have not heard from the recruiter yet. My first coding round very nice -- told the optimised solutions for both of the questions asked but for the second coding round in second question, I was able to code up the brute force solution but could not tell the optimized solution despite of hints given.

For system design interview, I was able to answer all the cross questions asked but I feel, I could not cover a lot of deep dives I had thought of covering in 40 minutes.

Behaviorial round went pretty good.

Recruiter has not yet informed about the level. I am seven years of experience total. The level should be either E4/E5.

What could be my chances of getting through?

Update:
It was a reject :( majorly due to coding rounds. The feedback for system and behavoirial rounds was a HIRE call.

Sharing the questions here:

Phone Screen:
Q1) Return T/F if a given string is a number.
Example: "123", "123.", ".123", "1.2.3"
Q2) Find the valley in a given array -- Return the index which is strictly less than its neighbours

Coding1:
Q1) https://stackoverflow.com/questions/69995292/algorithm-question-finding-the-cheapest-flight
Q2) https://leetcode.com/problems/mice-and-cheese/

Coding2:
Q1) http://leetcode.com/problems/lowest-common-ancestor-of-a-binary-tree-iii/description/
Q2) https://leetcode.com/problems/shortest-path-in-binary-matrix/description/ (Expected tc: O(n^2))

System Design:
Design a system similar to Leetcode

All the best everyone!