The thing is, you'll have to immediately scrub the "special elections" AND the 2023 elections out of your list of (election results that arguably are more predictive of 2024 than 2024 Presidential polling).
Special elections are far too low turnout and have far too much variation based on turnout differentials. For instance, during primary night in New Hampshire, Republicans swung a couple state legislative seats their way. I don't think that meant that the 2024 election was suddenly more R friendly.
Note that in 2022, Republicans did much better in NE-01 in the general than they did in the special, once higher turnout kicked in. What do you think even higher turnout for a Presidential race would do? Same thing applied to the NY-19 special election between Pat Ryan and Marc Molinaro, though the district lines were different in November (and Ryan wasn't up against Molinaro that time around).
The 2023 elections were a totally different animal compared with the 2024 elections. Kentucky and Mississippi's gubernatorial elections, along with the Ohio abortion referendum, are way too different from 2024 in terms of candidates, attention, turnouts from demographics, issues, etc. There were many Trump voters who voted to keep abortion rights in Ohio...and many Trump voters who stayed home in 2023 for that referendum but will turn out for Trump in 2024.
I would suggest focusing on the pattern we've seen within districts for the same exact kind of seat where R's improve the more turnout rises. For instance, Tom Tiffany did better in the general in November with Trump at the top of the ticket than how Tom Tiffany did in the special earlier that year:
https://en.wikipedia.org/wiki/2020_Wisconsin%27s_7th_congressional_district_special_electionand as mentioned before, NE-01 general was much more favorable to R's than the NE-01 special in 2022:
https://en.wikipedia.org/wiki/2022_Nebraska%27s_1st_congressional_district_special_electionAs more and more noncollege/working class/lower propensity white voters show up, R's do better. Trump is the best R for those kinds of voters, and those voters are already more likely to show up in Presidential cycles than they are in off-year cycles. On top of all that, Trump is a better R for lower propensity minorities as well, as shown in his improvements in multiple areas in 2020 relative to 2016&2018. R's improved slightly in 2022 in some places, but they don't have the same level of cred with them as Trump does.