When do Democrats regain control of the US Senate-2020 or 2022?

2020- Democrats need a net gain of 3 seats plus win the 2020 US Presidential Election or need a net gain of 4 seats without winning the 2020 US Presidential Election.
1 Democratic held US Senate seat up in 2020 is likely to go Republican- AL(Jones-D)
Democrats need to win 4 vulnerable Republican held seats up in 2020 plus the 2020 US Presidential Election or 5 Republican held seats without the 2020 US Presidential Election.
The 4 Republican held seats up in 2020 Democrats will likely pick up will be AZ(McSally-R), CO(Gardner-R), ME(Collins-R), and NC(Tillis-R). McSally-AZ,Gardner-CO,and Tillis-NC are weak Republican incumbent in purple/blue States. Collins-ME Democratic Challenger will benefit from the 2020 Democratic Presidential Nominee's coattails. Democrats will come up short in GA(Perdue-R), IA(Ernst-R), and TX(Cornyn-R).
2022- If Democrats occupy the US Presidency.
Democratic held US Senate seats up in 2022 that are competitive/vulnerable are AZ(Kelly-D), CO(Bennet-D), NV(Cortez Masto-D), and NH(Hassan-D). Kelly-AZ, Bennet-CO,Cortez Masto-NV, and Hassan-NH will win re-election due to Republicans nominating an extreme Conservative candidate.
Republican held US Senate seats up in 2022 that are competitive/vulnerable are FL(Rubio-R), GA(OPEN Isakson-R), IA(OPEN Grassley-R), NC(OPEN Burr-R), OH(Portman-R),PA(Toomey-R), and WI(OPEN Johnson-R).
Democrats will pick up NC(OPEN Burr-R),PA(Toomey-R) and WI(OPEN Johnson-R).