No. You said the Democrats won the fewest seats. That's not true.
As far as wave elections go the Democrats in 2018 won the highest vote percentage in history of a party that was the minority.
2018 United States House of Representatives elections - Wikipedia
The
Democratic Party won control of the House of Representatives in the 2018 midterm elections. The Democrats gained a net total of 41 seats from the total number of seats they had won in the
2016 elections.[
citation needed] This was their largest gain of House seats in an election since the
1974 elections, when the Democrats gained 49 House seats.
[8][9][10][11] Democrats won the popular vote by more than 9.7 million votes or 8.6%,
[12] the largest midterm margin for any party
[13] and the largest margin on record for a minority party.
[14]