What to Prioritize for Free Witch Queen weekend?

With the free weekend of WQ what should a newer player 1560 Power Level do first in an attempt to raise the power of my Titan? I’ve seen some people post about Legendary/Master Lost Sectors but I may be a bit too low to solo those.

I am 100% F2P and have almost no exotics at this point. Thanks in advance for the free advice 😀