This is not advice at all, just a simple method I personally use when there are dips or the market is in bear territory. I originally bought during the peak in end of 2013, watched as my modest amount of coins slowly trickled down in value for almost 3 years. Thankfully never sold (heeded the best advice for long term; "don't put in more than you can afford to lose")

It's quite simple, I have a small amount I keep to spend on crypto per month. A fixed budget. Any time there is a dip of close to 10% in the market I do a little "shopping". Typically pick up interesting coins or tokens that I've had my eye on in the past or ones that have caught my interest recently.

I consider myself to be quite cautious and risk adverse by this stage, but I certainly would not trade or take part in buying/selling, I am in it for the long term - and this is by no means some investment strategy, it's simple, stable, cautious method I use than keeps me psychologically happy with the situation

I'm actually excited to see a "significant" dip. Alternatively I am naturally happy when the market goes up. Of course I have no idea what will happen in the future, but I do know what's happened in the past, and anyone who has bought during dips in the last few years and held onto the coins has generally done well (of course traders and good knowledgeable buyers/sellers have also done well, but that's a different sphere)

In order to keep "real-time" track of the market I use a portfolio app on the phone, load in imaginary amounts of the top 50 or so coins, and that is a fairly good indicator of which way it's moving and how fast. Any time I spend some fiat to buy coins, I replace it immediately and keep it ready for the next dip (again, this are small modest amounts).. all the while sticking to the budget

Again, it's more psychological than any sort of advanced investment strategy, but my portfolio has only grown in value. This market (so far) does reward patience, it also rewards buying when everyone else is selling - a cliche I know, but so far has worked ok for me. Plus it keeps me happy (I'm a cynic and a realist about crypto). Just thought I'd share.