Hey there.
I deploy, for the most part, a simple dollar cost averaging strategy. This means I just buy holdings at particular intervals and I don't worry too much about price.
A very simple example of this is say I own 12 stocks, and I contribute $1200 a month to my investing account. I would simply buy $100 of each stock every month.
Obviously this is easier said than done, unless you are at a platform like Wealthsimple Trade that offers fractional shares (then it gets very easy, and is an amazing way to even out the ebbs and flows of the market) but the main point is simply to be consistent with purchases.
I do like to take advantage of short-term dips in market value on particular holdings, but this is generally a rarity. If you look to most of my portfolio moves I post here on Premium, it is the simple weekly additions of adding to companies, and I will spread my purchases out evenly over the long-term.