Larch prefer damp but not wet soil and 6+ hours of direct sunlight if you’re recently coming out of a colder season that could be why it looks sparse Larch are deciduous conifers and drop their needles in fall you could also check the roots and make sure it’s not pot bound or getting root rot but it may just need time or could be going dormant for the cold season as well hope this helps!

@Daniel Fonseca awesome i look forward to updates!