"Nobody buys a farm based on whether they think it's going to rain next year; they buy it because they think it's a good investment over 10 or 20 years." Warren Buffett
You'll be a better investor when you forget about your investments, providing you pick decent ones from the start."Don't just do something, stand there!" Jack Bogle
Once you have become enlightened to low-cost investing, and in particular broadly diversified index funds, select a stock and bond allocation for your needs, choose a few index funds to represent those broad asset classes (or a balanced fund that does it for you), implement the portfolio and go do something else for a few years.
Do not agonize over finding an optimal asset allocation, or picking the optimal fund in each asset class, or thinking you're missing something by not including complicated investment strategies promoted by others (usually for their benefit). That's all a waste of time and money.
The best investors I've met in my 30 years in the business are those who did nothing after picking a few low-cost index funds, except continuing to feed money into them. These people are much better off today than all other investors who thought the approach was too simple and continue to this day searching for a better way.
Keep it simple and let it work.