I did not read the entire post. But I read enough to realize you need professional help for at least the first year of dealing with this yourselves.
A 1065 Partnership return needs to be filed for 2019. The partnership return was due March 15, 2020 (there was "NO" extension for this, like their was for 1040 personal returns). The late fee is $200 per member for each month late. So your late filing penalty is already a few thousand dollars. So get professional help yesterday, if not sooner and clean this up and get things current.
