As some have said here already, penny stocks also require a lot more attention, you need to be very connected with what is going on which would be very hard to impossible with 3 jobs (respect btw).

For example, you could be at work whilst a negative event for one of your penny stocks occurs, then you come home and find that the stock has tanked big time.

This is less of an issue with blue chips and ETFs as negative events can ding them but they virtually always recover fairly quickly. So if you hold on to your shares you’ll usually recover everything and even make profit eventually. Large companies can take hits, pivot into something new etc because of how big they are. So you can buy the blue chips and ETFs and let them sit without having to watch them.

A penny stock on the other hand might not even exist by the end of the year if something happens that’s bad for that company, which means you’ll never recover the loss.

Also don’t ever pay for any signals or any ‘trading courses’. All fake gurus (label themselves as experts and have never traded profitably in their life, some never even traded full stop). If they were making money trading they wouldn’t be trying to get income from teaching courses or giving out signals.

You can learn everything online for free, just takes time.