HI

My site has more than 65.000 organic traffic per month and I am working on very competitive keywords.
now I need to measure my site estimated traffic growth for the next 12 month
for this I need to know my keywords impression per month and divide it to average CTR and then I can measure estimated Clicks

for some keyword
my search console show: 4600 impressions per month
Google keyword planner show: 12000 impressions per month (exact match)
Google keyword planner show: 377000 impressions per month (broad match)
Google keyword planner show: 1300 search per month (historical data)

you see these numbers have big differences and I am confused which number is correct and I can use it to measure my traffic growth per keyword

any ideas?