While GA4 is a powerful tool with a great price point (the standard version, at least, is free), it may not be for you. It is fundamentally different from UA and requires you to learn a new way of tracking data and new interfaces. So, even if you do use GA4, you will have to learn a new system. That means this is the perfect moment to be sure this new analytics system is the right one.
Here is a guide to determining that for yourself.