I'd recommend node-red. We've tried N8N, zapier, windmill, activepieces, flowfuse, crosser and can't for the life of me get off node-red.
We use it extensively in handling simply API endpoints, websocket pipelining, and extremely complex commerce and an AI workflows.
However, node-red is simply the best option for now. We're moving away from visual based coding for various accessibility and inclusivity reasons (not just human) and recreating the concepts of node-red flow-based-programming directly in cloudflare workers that are orchestrated by human+ai CI/CD flows.