The 8300H has a 45W TDP rating. Intel recommends that the turbo power limits be set to PL1=45W and PL2=56W.
If you need to set the PL1 power limit to 35W to try and control the CPU temperature then you should probably disassemble your laptop, clean it out and replace the thermal paste between the CPU and its heatsink. I have no idea how good or bad your cooling was when your laptop was brand new. In theory, a laptop that comes with a 45W processor should have a heatsink and fan that are capable of cooling it. Many laptops are poorly engineered and will overheat at their rated power level.
Also is there a lock on my computer? does it let me set? because prochot value is not unlocked
On the right hand side of the Options window does it show a Lock icon above the PROCHOT Offset value? Some manufacturers lock the PROCHOT (thermal throttling temperature) in the BIOS so it cannot be adjusted. If this is not locked, you can change the PROCHOT Offset value to whatever you like.