How would you go about this?

Hi yall, Didn't really have cash to invest last year, and the stocks I invested in before (but not enough, that's the thing) have skyrocketed since. Here they are, from the lesser amount I need to put in to complete what I have, to the biggest: UEC: average of 6.50, 14+ last time I checked few days ago, with an ATH at 16 RYCEY: average of 8.50, now at 17+, that thing never goes down Lundin Mining: average of 12.50, now at 31+, same thing, completely booming. What would be your strategy to keep your average prices relatively low?