Beam Analytics is the best GA4 alternative with the most generous free tier (up to 100k pageviews a month). It is GDPR compliant and cookie-free, and comes with funnel analysis, custom events and cohort retention.
JR and I frequently discuss matters of product, design, and business, and let me tell you something:
His products, including Beam, are crafted enthusiastically, prioritizing passion over mere profit. So, as a customer, you experience exceptional service and a lovingly made product. However, as a friend, all I get is annoyance when I suggest him to increase his prices.
Take that as you will and happy data-hunting adventures.
