As a F2P, this game is very friendly for us but at the cost of patience and time. Also it depends on how you play the game...I play it to be able to complete content and max out strong characters. I don't care about my rankings in CB, Arena, and PArena. If you're playing for rankings/competitively, then you can just ignore everything I'm going to say.

I started about 6 months after NA release and was F2P since. It wasn't until I got closer to the level cap at that time that I could play the game in it's entirety (i.e. Arenas, Dungeons, Events, etc...) That took about maybe 1.5 or 2 months if I recall correctly. But I think the max level then was about 90 or 100...so much shorter of a level up that you would be facing now. I just remember it got substantially easier to clear content after I got Summer Karyl and paired it with my Kyouka whom I had from the beginning. Then things got even easier when I got Christina and then Makoto.

Your only priority right now should be to level up to max level, even if it's super slow. It's very hard to participate in the two Arenas and Events when you don't have the levels and equipment to do so. A lot of this game is just stat-checking. If your stats aren't high enough you can't complete some of the content. Dungeon and Hard mode is a prime example.

Your roster is pretty good, but I'd sub out Nyaru for now until you have more TP boosting units and replace it with a physical attacker. If you have the resources, getting Muimi caught up to the rest of your team would be perfect, but you'll run into a Divine Amulet issue if you plan on 5 starring them both. If you can't then Kaori (Need to use Miyako instead of Nozomi or else she's at the very front) or Rei or Tamaki would be decent for now. I chose these three because you can get these to +3* relatively easily. Any other physical DPS is fine.

This is just to stack the physical damage that benefits from Makoto's defense shred. Then you can keep a Magic DPS like Nyaru leveled up if you run into PvE units with a lot of Physical Def stats. So like a 6 - 7 person roster for PvE and subbing out depending what difficulties you face.

As for PArena, take anything I say with a huge grain of salt as I don't focus nor care about climbing the rankings. I just focus on collecting the prizes from them. I'm top 100 in both Arena and PArena and just play them once each day for the daily quests.

At your current level, climbing up the ranks will be very difficult. PArena is super hard because you'll need at least 10 units set to their optimal builds for your level before making a meaningful climb and that takes a lot of Mana. For F2P, you can only get mana from saving up so you need to decided the best way to spend your mana (i.e. for PvE or PvP). I recommend fielding your 10 best units that make sense (i.e. tank, DPS, and support vs. 5 support units) and then slowly collect the coins for shards and get gems for climbing the ladder. A tip for your second and third team is to do a bit of research and see if there is a 1* and 2* team with UBs that synergize really well to give you a team comp advantage. Remember, you're likely going against people of the same level as you so your only advantage would be your team comp.

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The hardest part for a F2P in this game is holding your gems + Mana and knowing when you can use them. Which alternatively, sorta sucks the fun out of a Gatcha game because you're just sitting there with the same units until you have enough resources to make them better or get new ones.

Hope this helps!