Past performance is not an indicator of future performance.
If you want them because you like the cards then buy them, buy them but buy them with the knowledge they’ve already experienced significant growth in a period when everything experienced huge growth.
Collect what you like and expect to pay fair market cause it’s healthy for the hobby. Future value? Maybe good maybe not, but who cares? You’re only collecting what you like and that’s where the true value is;)
If you’re worried that the value of the cards might slightly decrease from when you make the purchase, maybe you don’t like the cards as much as you think you do.