The Saints obviously didn't offer the salary to Watson or the picks to the Texans that the Browns offered, so no, they didn't try everything to sign and trade for Watson.
They tried some things, but they didn't try everything. Maybe what the Saints was offering wasn't as crazy as what the Browns offered. We know it was less or Watson would be on the Saints rosters. The rumors were that the Falcons were also offering more than the Saints, but still less than the Browns obviously.