1) Drain/fill transmission fluid every 30k is worth it. I rather pay for the transmission oil every 30k than a new transmission. Btw, transmission oil drain/fill is less messy than engine oil.

2) Flush brake fluid - 3yrs or so.

3) Check your brake also when you get the brake fluid flush, see how much you have left on the pads.

4) Fill up windshield wiper fluid

5) Get something like this https://www.amazon.com/gp/product/B08N4WKJMT and watch out for your battery, it is better than getting stranded if your battery dies.