I started 5 campaigns 3-4 days ago, but I still have no impressions. I'm targeting different audiences of different sizes. Some are intent-related and smaller, some are interest-related and bigger, but none of them is running. Any solution, or do I only have to wait?

I am new to using google ads. A couple of days ago I launched my very first campaign. I recently learned that initially it is best to set the biding strategy as "maximize clicks" just to get enough data. However, currently my bidding strategy is set to "maximize conversions" and it appears that I am unable to change it. Other users have an option called "select a bid strategy directly". I don't seem to have that option. I suspect this is due to the type of campaign that I am running (Campaign type is set to performance Max). Does any one have any suggestions about what I should be doing in this situation ?