I would recomend to aim for those models uv'ed/textured and game ready. Post screengrabs on forums, discord art groups and get as many eyes as you can to see your work and feedback it. There good free tutorials on Youtube from Tim Bergholz for beginners with whole process. Since you aim for making worlds, get a small…
If you haven't taken still life painting classes, or plen-air painting classes, or foundational fine art courses, I would recommend doing that. Giving yourself a solid art foundation is almost irreplaceable and helps more than it wastes time. Design. Composition. Values. Color theory. A lot of tutorials that game art has…