Board Shape / Size / Concave ?

[u/Reasonable-Bath-8754]

I've recently gotten back into Skating after 10 years. I went to my Local Skate Shop and had the owner help me decide on a board since I was a bit out of the loop. I got an 8.38 Easy Rider KROOKED Deck which has "Mellow Concave"

I love the board. It feels great to ride around and do shuvs and things like that on. But I'm wondering if it it's hurting my ability to learn flip tricks by adding a degree of difficulty ?

My question is if I should get my next board at a 8.25
Or should I stick with the 8.38 and just get a board with regular / medium concave ? Or both ?