I like this.
Each piece of work is a mere pebble tossed into a flowing river. Maybe your pebble will become bedrock—sticking around for a long time and altering the water’s trajectory. Or, maybe it’ll quickly dissolve into dust when new pebbles come along and crash into it. Both of those outcomes are completely natural and worthy of celebration.
Having worked on several different products, I can attest to the highs and lows of seeing your ideas implemented but ultimately replaced over time. The hard truth is that as soon as you commit your work to the product and it’s released, it becomes the target of scrutinisation by both the product team and the people that use the product.
Ultimately your work will be replaced over time, but it’s all towards the greater good of learning what’s best for the product and for those that use it.