Of course it too late to add anything to the 457(b) or 403(b) for 2022, so your only option to defer more income would be to contribute to a SEP-IRA or a solo 401(k). If you already made the maximum annual limit in elective deferrals to to the 403(b), you can't make elective deferrals to a solo 401(k) for 2022 but you can still make an employer contribution from you self-employment income, the same amount that you could contribute to a SEP-IRA (SEP-IRA contributions can only be employer contributions).
For 2023 and beyond, you might find it beneficial to make elective deferrals to the 457(b) because there is no early-distribution penalty for distributions from a 457(b) with respect to funds derived from 457(b) contributions (but not amounts rolled over to a 457(b) from another type of plan). The elective deferral limit for the 457(b) is separate from the elective deferral limit to other plans combined, so there is no need to worry about that.
If you intend to make elective deferrals to the 403(b) equal to the annual limit in the future, there would be no benefit to having a solo 401(k) over a SEP-IRA since you would not be able to make elective deferrals to the solo 401(k), only the same employer contribution that you could make to a SEP-IRA instead.
