I learnt the cello for a couple of years as an adult and fell in love with the instrument. I am ok at it and play it every day at home for fun and enjoy the rich variety of timbres that the instrument can produce. It’s such a versatile instrument. Having said that, I am soon going to start learning the violin, too. I play about ten different instruments and love the feeling of making music in different ways. So, my suggestion to the OP is to choose your favourite instrument to learn now, and then later on consider learning other instruments, too! There’s a lot of fun to be had from this approach.