What needs to be done now is Congress must get the full un-redacted Mueller report.
Then release a redacted report to the public protecting classified information and details to open investigations.
They need to subpoena Mueller for testimony.
They need to get evidence from the SDNY on Trump's potential financial crimes that are currently being investigated.
They must have Trump testify to answer any open questions on ongoing investigations into activities related to him leading up to the election and since being elected.
If the DOJ will not indict a sitting president it is up to Congress to their job for checks and balances and protecting the country from corruption.
Impeachment on obstruction and perjury will be low hanging fruit.
If there are financial crimes they have to be on the table as well.