Ideas...
Incorporate an LLC with 1 or more of the rental properties that you want some further liability protection. The corporate entity could sustain a 401K plan and be a write off.
Another idea, is focus on tax exempt CEFs that generate income from your state's municipal obligations. Totally tax free, and the threat (or soon reality) of rising interest rates is making "Mr. Market" become irrational with some CEFs near 2009/2010 levels. Dollar cost invest your new-found monthly income stream in them, set the payments to reinvest and let it ride tax free after that and avoid the whole mania over 401Ks. My accountant marvelled at how much people focus on not paying taxes when they can work the game to their favor without limits.
Go, invest, win, FIRE!