Conversation so far:
How did William H. Seward campaign for Abraham Lincoln?
Seward was urged to undertake a campaign tour of the Midwest in support of Lincoln and did so for five weeks in September and October, attracting huge crowds.
Did the 1860 presidential election get thrown into the House of Representatives because of an electoral vote deadlock?
On Election Day, Lincoln carried most Northern states and became president.
When was Abraham Lincoln elected president?
On Tuesday, November 6, 1860 in a four-way contest, the Republican Party ticket of Abraham Lincoln and Hannibal Hamlin emerged triumphant.
Are there any other interesting aspects about this article on William H. Seward besides his campaigning for Abraham Lincoln in 1860?
His firm stance against foreign intervention in the Civil War helped deter the United Kingdom and France from possibly gaining the independence of the Confederate States.

Question: what did he go on to do next?
Self-contained rewrite: What did William H. Seward go on to do next after campaigning for Abraham Lincoln?