Portfolio advice

48 year old looking for recommendations on whether the way I am investing makes sense. My portfolio is with Fidelity, and my employer does not allow any 401(k) funds or ETFs outside of their curated options. I started learning about investing only 4–5 years ago and still have a long way to go. For the next 4–5 years, my biggest expenses, apart from regular living and mortgage costs, will be fully funding my children’s college tuition. I would like to open a brokerage account with around $10k, but I am unsure what the best portfolio mix would be for my age. I hope to retire around age 63. I am glad that I started self-learning, even though it was late in my life. At least I can educate my children better. Thank you !