Arizona>Iowa>Georgia>>>>Ohio
This. Georgia (and Texas) will be ahead of Iowa by 2024, however. Right now, I'm thinking there is a >60% chance AZ, PA, WI, and MI vote Dem, which would extend downwards to 45% FL, 40% IA, 35% GA, 25% OH, and 20% TX.
If Dems win the Presidency in 2020 with less than 320 EV , TX will take a longer time to flip . Especially if that Dem is Bernie or Warren.
If Dems win the WH in 2020 without OH and TX, TX probably stays solidly GOP in the 2022 midterms and in 2024 probably barely even contest it. TX is not going from Likely R to Tilt D with a Dem in the WH. The most probable scenario is it stays at Likely R in that case.