You should pull on Crystal Tower banner asap. With your free two picks, I would grab Sarah and Larsa. If you plan on spending any money on gems, I would strongly recommend making a pull on the gem-select banner as well. I've never spent any money on this game except for that banner. If you decide to pull there, I would pick up Onion Knight BSB and Cid Raines BSB. Onion Knight requires some investment to get to 99 and full dives before he becomes super useful, but is one of the strongest utility characters we have currently available. The gem-select banner is a really solid investment, since originally it gave us a choice of a guaranteed burst relic from the list, but since DENA screwed up, we are now able to pull two relics instead, making it silly to pass up if you plan on playing this game long-term. Cid Raines + Onion Knight + Larsa + Sarah is such a strong mage team that you can probably steam-roll most of the content up to D120 to D180 using these characters once they are leveled.
After that pull from the Lucky Draw. Start clearing out realm dungeons to build your stamina asap. In between realm dungeons, try to clear out the first 5-10 stages of each Renewal Dungeon to pick up lots of free mithril / souls / orbs / growth eggs, etc. You can use the roaming warrior system to easily 1-shot most bosses using an overstrike roaming warrior.
I would go to this search function and fill up your roaming warrior list with Thunder God overstrike.
Also grab a few Hyper Mighty G, grab a few Sentinel's Grimoire, and grab a couple Vessel of Fate. You can also ask here if you need to know a good overstrike that targets elemental weakness, since Thunder God is holy/lightning, and some enemies will resist both.
There's always https://friends-ffrk.com/ that we can use.
https://friends-ffrk.com/ For all your RW needs.
I moved the tracker to new address (sidebar has updated links). My previous hosting place was changing naming for domains so I had to move to some other place.
If you need help primarily with dealing damage, it's an option.
If the petrify is more of a problem, you could use an RW that gives status blink. Tyro USB, Red XIII USB, and Vanille USB are good options for party buffs + status blink.
Here's another RW-tracker site.
In future, you can use https://friends-ffrk.com/ to search for RWs easily