US Senate seats Democrats will gain in 2020,2022, and 2024.

2020
AZ special(McSally-R) Kelly-D
CO(Gardner-R) Hickenlooper-D
ME(Collins-R) Gideon-D
NC(Tillis-R) Cunningham-D
+4D( Democrats lose AL-Jones-D but gain GA -Isakson-R).
2022
FL(Rubio-R) Fried-D
IA(OPEN Grassley-R) Sand-D
NC(OPEN Burr-R) Cooper-D
OH(Portman-R) Ryan-D
PA(Toomey-R) Shapiro-D
WI(OPEN Johnson-R) Barnes-D
+6D
2024
FL(Scott-R) Murphy-D
TX(Cruz-R) Allred-D