We have a material wrap one thingy and it's amazing. My LO is probably around 20lbs now but it's breathable too so he doesn't get hot x
I used my ergo baby omni breeze with my eldest until she was a toddler! And she’s not small! Really supportive x
Might be worth trying to get to a sling library as what works for one might not work for you. I know the Tula Free to Grow is a popular carrier and I do love mine but there are loads out there. Also might be worth asking in Babywearing UK on Facebook for recs x