Hiya! I dunno if you still need help, but what tablet do you have? Since you said "Google Play" store I'll assume it's an Android, so in that case, my sister uses a free program called Medibang Paint that she really likes! It should be decently powerful since I follow a lot of artists that use it professionally even.
I bought an iPad recently, so if you have an iPad there's a paid program ($10 USD) called Procreate that's super popular and that I've been having fun with lately! On my computer I usually use Clip Studio Paint (get it when it's on sale, because they always have a ton of sales), and I just realized that you can get a subscription-based version for the iPad!
I hope that helped!
