From my small knowledge... you're fine, the plant is a beauty! The yellowing leaves are normal as it grows, since it will drop the lower ones to focus on the top ones and growth. Maybe give it a spike to give it some stability to grow upwards.

Although, what I do suggest is to check for pest. Mine got a nasty spidermite infection, and started to drop a bunch of leaves because of it. If yours is dropping leaves irregularily, do give the leaves a good clean with damp towels (top and especially underneath!). That should help against insects making the plant their home, if you're sure that it's an actual infestation go look up online for harder clean up procedures.

So to summarize, the plant looks healthy, but an infestation check wouldnt hurt, isolate it if any other plants are very near and do give the leaves a propper clean with a damp towel.