Is there an unwritten cutoff to matrilineal Jewishness?

We’ve all (hopefully) got sixty-four 4th great-grandparents. I’ve built out my family tree to this point and further with paper trail, and my matrilineal 4th great-grandmother was Jewish.

I’m 100% happy in thinking of myself as Jewish.

Others haven’t been quite as enthusiastic and some have even outright stated I’d be taken more seriously as a convert – and I can’t disagree – a Venn diagram of mitzvot shows that I’d have more responsibilities to uphold than either, so I thought I’d ask if anyone else here is Halachically both Jewish by birth and conversion? How has this shaped or had an impact on your practice of Judaism? I took up the conversion process a while back and chose to stick with it (the learning alone has been worth the journey).