FILE_PATH="/my_files/"
for file in "$FILE_PATH"/*.txt; do
    tmp=${file#*-}; head=${file%-"$tmp"}
    mid=${tmp%-*}; tail=${tmp#"$mid"-}
    base="${head,,}-${tail,,}"
    dir=${base%.txt}
    mkdir -p "$dir"
    mv "$file" "$dir/$base"
done

|-- ./
|   |-- xxxx-aaasw1
|       |--xxxx-test_file-aaasw1.txt
|   |-- xxxx-bswb2u
        |--xxxx-test_file-bswb2u.txt.

|-- ./
|   |-- xxxx-v3u
|       |-- xxxx-test_file-caa-v3u.txt
|   |-- xxxx-
        |-- xxxx-test_file-caa-v3-.txt.