You started at 1250 blitz. You are now 1650 blitz after about 5-6 months. This is decent progress in blitz. If it took you 5-6 months to get +400 from 1250, it may take you 10-12 months to get the next 400 points, or even more time. It's harder to improve the higher you go.
Improving My chess
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I have started playing chess from last year onwards. Around 5-6 months
i am 1600 rated now. Am i doing good? and can i reach a rating of 2000 in next 6 months if i play regularly like this.