Long laundry list , just listing what comes top of the mind : beginning with the infantry - proper winter clothing & kits , BPJs , assault rifles , NVGs / TIs , etc Armour - Light Tanks , Artillery - TGS , MGS , Guided & Unguided Rockets with ranges between 30- 400 kms etc
Then there are TBM / SRBM , IRBM / MRBM apart from Army Aviation Corps being significantly enhanced for CAS , procurement of MRFA , speeding up procurement of LCA Mk-1a , faster upgradation of the entire fleet of MKI for IAF , enhanced ISR , Cybersecurity , the whole works , all of which we need in place by 2029-30 at the latest.
Not only do we need all these in huge numbers but we also need to set up mfg of these in huge numbers during war time for quick replenishment .