Adobe Stock plans

Hello,

I use about 80-100 Stock pictures from standard license. Right now my plan is a year plan with 40 pictures per month, paid monthly 40,28 euro (so 1,007 euro per 1 photo). When my 40 pictures end,  I just buy another ones by clicking a one-time purches for 1,99 euro/piece. The next bigger plan is 350 pieces which is too much. I would like to buy 80-100 photos per month in the same price of 1,007 euro. Do you have some tips how to do that? I tried to change my plans from 1 plan to 2 plans but it's not possible. I also tried to create a new account and just buy another 40-pieces plan, but the prices are totally different?! I just don't get it. In Fotolia times there was a pefect plan of 100 pieces and when you've run out of downloads, you could just buy another ones for the same prices per pieces. Adobe complicates everything.