You most likely don’t have time do add to the 403(B) plan for the 2022 year if you do you should add it their first. However if you don’t you should open up a Roth IRA with and big brokerage eg. Fidelity, Vanguard, Schwab, TDAmeritrade you should then max out the contributions. If you are not an experienced investor you can always invest in a target date fund just like your 403(b) plan should be invested in eg with vanguard a Vanguard Target Date 20__ (insert year of retirement)