Okay so..

I currently have 2 credit cards open under my name. A lowes card that is still open but has a $0 balance with about $5k of available credit left. We got the lowes card when we bought a washer and to be honest I I ever go to lowes and have barely used it since we paid it off because it can only be used there. Lastly, a discover card that I owe a little over $2k on.

Monthly payments on my discover card are only like $80 but I make payments of at least $200 each month and have never been late or missed a payment.

I do have student loans and a car loan. Student loans have not been paid on yet. Car loan is about a year old, automatically gets paid each month with no missed or late payments.

Credit score is in 730s (highest has been 760s) and revolving utilization is around 29%

I keep seeing that having available credit looks good on your score, but I may be misunderstanding what I'm reading.

Would it be harmful or helpful to open another credit card for the available credit? I dont really plan on using another one unless it's a charge under $50 a month just to build some reliability. I don't use my discover now and am just working on paying it off but have established a good payment history with them. I'm trying to build my profile to hopefully be able to buy a house in a year or two ♡