Nadal won 5 slams from 2017-2019, I think that's the 2nd most successful 3 years he's has at the slams, from a pure numbers perspective? 5 slam wins, 2 finals, 3 SFs.
He went deep at literally almost every slam he played, too. F, QF (great match Vs Cilic, unlucky with injury) and F at AO; W, W, W at RG; R16 (great match Vs Muller), SF, SF at Wimby; W, SF (unlucky with injury), W at USO.
That's probably his most ever slam wins in a 3 year period