No reason to panic LAGS. They say the fee will only apply for a game making more than 200,000$ / year ( or 1,000,000 $ if you have Unity Pro*), I'd imagine that you're far below this threshold, considering most of your games cost only a few $, correct? Then, no need to rush things.
Unity made a really pathetical move and it's a good idea to eventually migrate to a new engine because this company cannot be trusted anymore (in the future I'm expecting them to probably add a "per-execution fee" as well, cos "modern gaming"). But so far, the overwhelming reaction from the dev community seems to have already made them retract some of their initial statements (for example demo/re-installs are not counted anymore), and you can be certain there are several studios preparing the lawsuit already. There's a good chance this thing won't affect you at all.
Worst case, there'll be tools to automatically convert Unity projects to Godot: again, there are thousands of developers in your situation, be certain that these tools will develop at exponential speed now.