Well, the 1st thing to do would be to go through the differences between a solo 401k vs a sep ira for your self employed income. Then compare that to the employer sponsored 457 plan.
On seps and solo 401k's see HERE https://www.irs.gov/retirement-plans/one-participant-401k-plans
Also HERE https://www.irs.gov/pub/irs-pdf/p560.pdf
And HERE https://www.irs.gov/retirement-plans/irc-457b-deferred-compensation-plans#:~:text=Plans%20eligible%2... for the 457(b) or 457 in short.
After you go through this information, you will be able to more narrowly focus in on your given situation and proceed from there.
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