Recover lost space and partition after failed uninstallation of bootcamp

Hi

I wanted to recover the space that I used for my bootcamp, but something went wrong and now I am stuck with 419GB OSX, 80GB of former bootcamp that I can't partition and 650MB free space that is not removable or resizable at all.

When I try to remove the 650MB of free space, by selecting it in the disk utility partition window and clicking on the "-" button and hitting apply then Partition an error comes up:

Running operation 1 of 1: Remove “--”…

An internal error has occurred and the disk for one of the specified operations could not be found. This may be a temporary issue, try again.

Operation failed…

I am not able to select the 80GB partition and merge that with my existing OSX partition. The "-" button is greyed out, even when I am in recovery mode.

I don't really care about the 650MB space, that can be forever lost on my SSD for all that I care, but I would very much like to get my 80GB of space back, can anyone help me?

My results for "diskutil list" is:

/dev/disk0 (internal, physical):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      GUID_partition_scheme                        *500.3 GB   disk0
   1:                        EFI EFI                     209.7 MB   disk0s1
   2:                 Apple_APFS Container disk1         419.0 GB   disk0s2
   3:                  Apple_HFS Untitled                80.1 GB    disk0s3

/dev/disk1 (synthesized):
   #:                       TYPE NAME                    SIZE       IDENTIFIER
   0:      APFS Container Scheme -                      +419.0 GB   disk1
                                 Physical Store disk0s2
   1:                APFS Volume Macintosh HD            414.5 GB   disk1s1
   2:                APFS Volume Preboot                 21.0 MB    disk1s2
   3:                APFS Volume Recovery                519.0 MB   disk1s3
   4:                APFS Volume VM                      1.1 GB     disk1s4