So you do have probably -10% A Atk, -10% A Def, and -10% B Atk/Def... that's pretty good for someone who just started.
You're very focused on heals, but uh, are you in position to heal? I mean, your max HP has got to be miserable. There is a time when you're still weak when heals can help a lot (veteran players often don't bother with heals at all), but I don't think you're quite at that point just yet.

Well, without rerolling, I don't you'll be doing Expert Advents for a while. You simply need to become stronger first. And this means more SR weapons and more SSR Eidolons (REALLY important for HP) from events. Once you start getting there, then it's time to pay attention to your Grid; feed 1 R per the skill level of a SR weapon. Get like a full grid of Wind SRs with skill level ~10 Assaults on them, and Experts should be very doable (even without elemental advantage). Notice that at this point, auto-set probably has no fucking idea what to do - it tends to care about base Atk more than skill levels.

If in addition to that you can get Cybele and Oberon to level 65, you'll bump your debuffs to -30%. Add in Zephyrus (from Gems gacha) and you'll be at -45% Atk. That'd be a good start for you, but again... you'd still be weaker than a freshly rerolled account.

Well, enjoy your time in Kamihime. There's always things to do in here. The grind will not end. And yet again... it's just about never too late to reroll. Please do consider that if you enjoy the game, YOU WILL REGRET IT otherwise.