That's a pretty cool list actually. Assuming hypothetically that 2018-2019 is the reset for the DCEU and they get to enjoy eleven years of success same as the MCU has, and perhaps even supplant them at some point, I reckon I'll go with the following films with their respective foes:
2020 - BOP (Black Mask)
2020 - WW: 1984 (Cheetah & Maxwell Lord)
2021 - The Batman (Court of Owls & Deathstroke)
2021 - Suicide Squad 2 (Joker & Royal Flush Gang)
2021 - Black Adam (Vandal Savage)
2022 - Man of Steel 2 (Intergang & Parasite)
2022 - Green Lantern Corps (Sinestro)
2022 - The Flash (Eobard Thawne/Reverse-Flash)
2023 - Aquaman 2 (Black Manta & the Deep Six)
2023 - Justice League 2 (Legion of Doom: Lex Luthor; Joker; Cheetah; Reverse-Flash; Black Adam; Sinestro)
2023 - Shazam 2 (Sivana & Mr. Mind)
2024 - WW3 (Circe & Medusa)
2024 - Batman 2 (Gotham City Sirens: Catwoman, Poison Ivy, and Talia Al Ghul)
2024 - Martian Manhunter (Maxima & Lobo)
2025 - Flash 2 (Captain Cold & Weather Wizard)
2025 - New Gods (Darkseid & Female Furies)
2025 - Man of Steel 3 (Brainiac & Metallo)
2026 - Teen Titans (Brotherhood of Evil)
2026 - Green Lantern 2 (Star Sapphire & Sinestro)
2026 - Justice League 3 (Darkseid & Mongul)
2027 - Zatanna (Doctor Destiny)
2027 - Captain Atom (General Eiling & Major Force & Plastique)
2027 - Hawkman & Hawkgirl (Gentleman Ghost and Solomon Grundy)
2028 - Booster Gold (Chronos & Doctor Polaris)
2028 - Flash 3 (The Rogues: Captain Cold; Heat Wave; Trickster; Mirror Master)
2028 - Batman 3 (Hush & Joker & Whisper A'Daire)
2029 - Green Lantern 3 (Krona & Darkstars)
2029 - The Outsiders (Secret Six: Bane; Catman; Rag Doll; Lady Shiva; Killer Frost; Sportsmaster)
2029 - Supergirl (Silver Banshee & Giganta)
2030 - Nightwing (Joker's Daughter; Hugo Strange)
2030 - Teen Titans 2 (HIVE & Trigon)
2030 - Justice League 4 (Anti-Monitor)