2020 US Senate Election- How Democrats can win the US Senate seats to get them in the majority?

35 Democratic held US Senate seats are not up for re-election in 2020.
Democratic held US Senate seats up for re-election in 2020 that are Safe D
36)RI(Reed-D)
37)MA(Markey/Kennedy-D)
38)DE(Coons-D)
39)NJ(Booker-D)
40)OR(Merkley-D)
41)IL(Durbin-D)
42)NM(Lujan-D) can be competitive if Martinez-R runs.
43)VA(Warner-D)
Democratic held US Senate seats up for re-election in 2020 that are Likely D
44)MN(Smith-D)
45)NH(Shaheen-D)
Democratic held US Senate seats up for re-election in 2020 that are Lean D
46)MI(Peters-D)
Republican held US Senate seats up for re-election in 2020 that is likely to go Democratic.
47)CO(Gardner-R vs Hickenlooper-D) by a high single digit margin.
48)AZ special(McSally-R vs Kelly-D) by a narrow margin.
49)NC(Tillis-R vs Cunninghman-D) by a narrow margin.
50)ME(Collins-R vs Gideon-D) 2020 Democratic Presidential Nominee needs to carry the ME-2CD and win ME-1cd by a landslide margin.
51)Either or Both of the GA US Senate seats or IA- 2020 Democratic Presidential Nominee needs to carry GA and/or IA.
51)AL(Jones-D) if Moore-R is the GOP Nominee or Sessions-R is the GOP nominee and Trump does not support Sessions.
51)KS(Bollier-D) if Kobach-R is the GOP Nominee.