Sign Josh Donaldson
While every Dodger fan wants Anthony Rendon, there is a good chance he never leaves the Nationals. Not to mention that if the Dodgers sign him, they would need to get very creative in how they fill their other roster weaknesses. Josh Donaldson is the next best third baseman and he will likely sign a two-year deal. Keeping in line with the theme, his contract would clear after 2021.
Not only is Josh Donaldson a serious power threat, but he is also an underrated defender. He posted a DRS of 15 in 2019. Signing him could shift Justin Turner to first base and Max Muncy to second base. Gavin Lux would be without a position but he could always get a few starts a week at second base, shortstop, and possibly even the outfield if the Dodgers choose to try him out there.
Justin Turner is in a contract year in 2020 and his defense at third base is becoming an issue. Donaldson could fill in at third base for 2020 and 2021 bridging the gap to either Corey Seager at third base or Kody Hoese. His contract would be up after 2021 which is when the Dodgers see a ton of salary come off the books just in time to extend some of their young core.