Recommendations on buying REQ packs please.

I’ve been reading and I got to know that “completing” all the unlocks from a specific range of REQ packs will start giving REQ points instead of more unlocks. For example completing all Silver packs unlocks gives you 3000 REQ points (I don’t know if it’s true).

So should I keep buying Silvers until I get REQ points to make it easier to get Gold packs or how does that work?

Yes you should start with bronze actually and then silver’s and then golds. Stop buying them when they start giving you a req points card every time.