I work with what you already have. Before introducing anything new, I look at the tools your clients are already paying for, the apps, the platforms, the subscriptions, and ask how far we can get with those. New monthly costs only come in when there's no other way.
Shopify is where most of this happens. Every store I work on has a different story, a different pain, a different team. That variety is exactly why I like it. You don't solve the same problem twice.
I've been doing this for real clients, on live stores and websites, for years. Wonderful Dental. Zoe Rowyn Bridal. E-Flight Academy. MKB Digiwerkplaats. Match-IT. Not experiments, production, with real people on the other end waiting for it to work.