How to get 3-4 letter usernames?

Hello BHW Community,

I am really curious on finding out the most efficient method to getting a 3-4 letter username for my Instagram handle. This will be solely for personal use so don't worry about clicks, engagements, etc.

I have tried messaging people who own specific usernames but 10/10 times they will not respond and/or the account is inactive. I also found that there wasn't really a category for this in the marketplace either.

Any tips or a point in the right direction would be…

How to get 3-4 letter usernames?