28M, just started investing, looking for feedback on my 84.5% Core / 15.5% Satellite portfolio

After spending quite a bit of time learning about investing, portfolio construction, and ETFs, I finally started investing at 28 and wanted to get some feedback from people who’ve been doing this longer than I have. My portfolio is structured as: Core (84.5%) VTI: 68% VXUS: 21.1% SMH: 10.5% Satellite (15.5%) ROKT/NASA (Space): 57.2% URA/URNM (Uranium/Nuclear): 42.9% My reasoning is that I want the vast majority of my portfolio in diversified, low-cost ETFs that capture broad market returns (VTI