Unsure of how to proceed!

Hi all! I've been lurking here recently trying to determine which carrier I should try. My 4mo is now about 15lbs and our Boba Bliss carrier is starting to get really uncomfortable. My lower back is hurting even after short walks.

In reading different threads, I'm thinking LennyLamb Upgrade/Pro, H&P Lark, and Oscha Bairn may be decent options for us. I'm totally open to other suggestions though! One major obstacle is I'm in a rural area and there are no baby wearing groups or lending libraries remotely close by, so trying out a variety of carriers before buying doesn't seem like an option. I am keeping an eye out on Marketplace and a couple buy-sell-trade groups. I've heard about Little Zen One but am hesitant to try it (dunno why, if you've had a good experience with them please share!).

*I'm about 5'7 and plus size

*I'd like to find a carrier that will work for us long term (until baby is 18mo-2 years if possible, depending on how chunky she gets!)

*Carrier would primarily be used for mid-long walks (around town and on the beach) and errands, like trips to the grocery store

*Climate is mild, but we found ourselves overheating in the Boba Bliss (even though we both seemed to like the carrier!)

*Carrier must be easy to put on by myself

*Primarily front wearing, though my partner will probably switch to back wearing eventually. Not planning to wear front style with baby facing-out.

I'm open to both waterfall and apron style, but leaning towards apron style because the Boba Bliss has a waterfall waist and I found it chafing against my tummy/love handles a bit. Open to crossback or h style, but only have experience with crossback so far.

Thank you all in advance!