Welcome back. I definitely would not start over. If you aren't already, make sure you're logging in everyday to get Rathalos (time sensitive login champ) if you haven't already.

As well, could you post your roster and perhaps some of our fine forum regulars can help you find a direction again?

Sure.

How do I do that?

you'd have to look it up depending on your device if mobile, if on desktop alt + print screen (then paste that to paint, save the file and upload it here). there's quicker/alternate ways with regards to desktop screenshots as well.

while taking a screenshot of your roster it'll be best if it's in panoramic mode, rather than the vertical one that shows less. also would be good to get a look at your vaults if you have rares, epics or legendaries in there too.

Where are my vaults?

Here are all the champions I have.

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From what i can see, Rathalos is your only legendary right? I'd check online to see if there's any Promo Codes for New Players right now that give you a free Legendary. If so, it might make more sense to start over and get Rathatlos + the Promo Code Legendary. 

HOWEVER: Do not delete this account, just start a new one. Play both for about 2 weeks and you'll probably decide to keep your original account. Especially since all the "Returning Player" Boosts.

re: Vaults, go back to the other view (vertical) and then click champion vaults (though it looks like you have all your champs out)

so I wouldn't bother with another account personally. the best active codes are Deacon Armstrong & Mordecai and I don't think those are worth starting over for with what you have. 

You have an ally attack champ in Longbeard, one of the three non Mythic counterattack champs in Skullcrusher, a potential unkillable CB champ in Warcaster along with Stag Knight (60 ASAP) who's one of the very best defense down champs in the entire game.

I'd 60 Stag & Rathalos ASAP, get the CB/Dragon team sorted. I'd also stop taking too many low impact champs - especially rares - up to 50 (looking at Warpriest who's a future chicken & Athel.)

This is a reasonably solid account, just needs to get grinding for gear. 

All my Champions in the Vault

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Fellhound is the champion farmer who completes the campaign in 5 seconds. Look for a video. 

Very much agree with this advice.

You've got some solid champs to start with. :)

Be sure to fill up your FG slots for the bonus.  

FG?

Also level up Warcaster and Stag Knight going through campaign? 

Faction Guardians.  You can find them in the Guardian Ring.  The bonuses add up and carry to all aspects of the game.