Can you tell me what are the conditions of your reaction? 

You have to have the 1st, 3rd and 5th position of the pyrazole protected then you can remove the bromide by using BuLi and then react it with isopropyl. It will give you low yield but it will react. 

If NH is free on Pyrazole, protect with Boc anhydride and then do Suzuki in presence of EtOH:Toluene (1:1) as a solvent, K2CO3 and tetrakis.

First, protect NH of pyrazole,  then prepare 4 Li derivative  at -70 C, 4-Li pyrazole is unstable and easily converted  to  5- Li. Then try reaction with acetone, and reduce OH group by ionic hydrogenation ( Et3SiH/CF3COOH) or by dehydration/ hydrogenation sequence. Keep in mind that position N(1) is metallating  first, and C(5) Li derivatives is much more stable than C(4). Please, consult the  literature first.