It looks like you are team cash back? You have 2% min covered with your Navy cR+. And you have a few 5% rotators. How about another 5% rotator? citi Custom Cash? You can start with the pre-qual tool.
https://online.citi.com/US/ag/cards/pre-screen
Others might have better ideas. 
GL!
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You opened 4 cards in less than a year. Your newest is only 1 months ago.
I feel like you should garden NOW because you're going to be getting some serious diminishing returns in SL if not outright denials.
I'd sit pat and make a game plan instead. Plan out your next card, yes, but for a year from now, not before gardening. Think about your overall lineup goals, and how to move towards that. What are holes in your line-up for your major expenses? Are there credit unions or other relationships that you should work on building to be approved down the line?
You mention the eventual goal of "Biz Funding"... make sure that the Chase Ink cards are on your radar, but remember that the 5/24 rule will apply so either get one NOW as your 5th card, or you have to wait until you're back under 5/24 to add any (and they're worth it!!!)
Alternately: try for an AmEx. Either a BCE or a BCP (either would cover Groceries/Gas, which you do not currently have a specific card for, and the BCE gives 3% US online shopping as well). The reasoning being that once you have a relationship with them, they don't usually do hard pulls for future cards, so that will save you inquires down the line. Also, AmEx is awesome.
EDIT: Also, I didn't see @JoeRockhead had also recommended an AmEx until after I posted this, lol.
Biz - 
Authorized User - 
Debit Cards - 
@Salahh wrote:Thank you guys for the great tips. I just got approved for the max $8k CLI on Navy Fed card (posted in approvals as well). Will def look into Citi and AmEx pre-approvals for a possible next card.
As far as specific rewards go, I'm not too picky. I am considering doing ecom and have heard the AmEx Gold is the best card for 4% back on ad spend, so maybe I'll look at that.
Appreciate you all! 🙏
Not sure what ecom is, nor what ad spend is? The AmEx Gold Card does not give % back. It gives MR points. Everyone values those differently from 0.5cpp to over 2cpp. It has an ouchy Annual Fee.
Good luck with your decisions!
@Salahh wrote:Ecom = e-commerce. In my case, dropshipping using ads on social media
ad-spend = paying for those ads
It's just what I've heard. I haven't actually confirmed with AmEx.
Other than that, goal is mostly just to increase avail. credit (total now $27.5k) :-)
You're thinking of the Business Gold, not the personal Gold. Personal Gold AmEx is 4x Groceries/Restaurants.
Biz Gold is 4x on your top 2 monthly spend categories (out of 6 categories), one of which is "US media providers for advertising in select media (online, TV, radio)", as well as credits that can be used at FedEx ($240 yearly, divided up into monthly).
We have a separate forum for business credit, but some of us do include biz cards in our line-up.
@Salahh wrote:Oh, thank you! You just saved me from getting a personal AmEx Gold for no reason
Speaking of AmEx, last time I applied (BCE), they asked me to connect my bank and after assessing they instantly denied me (it's not impressive)
And that's a definite sign you should NOT apply for any more cards for awhile!