I also have RSUs at my current company.

I highly recommend looking at the individual lots of stock and picking and choosing which lots to sell. Also, learn about wash sales and how they will affect you. Candor has a decent write-up about wash sales and tax implications that may prevent you from tax loss harvesting (https://candor.co/articles/money-matters/wash-sales-what-they-are-and-how-to-avoid-them). Of note, if you sell your stock to take the loss and then have RSUs vest within the window, it may prevent you from taking the loss.

My tactic is only to dispose of lots that are positive (sometimes barely positive). I've been fortunate to be able to do so while continuing to vest additional stock.