Would you become Jewish if you were a non Jew? I think that is the question…
I say it depends on what you think your providence really is…
If you identify with the Jewish people and then spend your time reading their books etc, especially the Jewish Tanakh as well you have a firm G-d beleif, I say you give it a go.
If you learn about the universe and realize that the Jews are like a tree in a forest and the non jews are like the plants and weeds and you just want to do it to be like the Jews, I think your plan is going to be see-through. I don’t think you could genuinely become Jewish, but if you really found meaning in the Jewish religion, you might want to give it a go too.
As for being a Jew and wanting to become religious, I say who knows what our children of non-affiliated movements will do in their lifetimes. If you are non- affiliated, your priority in life is to your job and family. That said, it is not to your own religious background per se. If you suddenly become more frum, that is great. It is going to be a challenge, and G-d willing a learning process.
But I suspect that true Ba’al Tschuvahs are very rare indeed. Some modifications of the Jewish way of life do not seem to “jive” with some of the careers of these previously non-affiliated individuals. It also has a big family ramification. Imagine growing a full beard if you really wish. That does not immediately get approval by many of those who hate facial hair of any significant length.
But given a good G-d orientation, give it to Hashem to guide our people into their futures.